Introduction
The 2026 Winnebago EKKO 23B is a Class B+ motorhome built on a Mercedes-Benz Sprinter 3500 all-wheel drive chassis, and Transwest Truck Trailer RV in Frederick, Colorado has one on the lot with a few notable options. This particular unit skipped the generator in favor of doubled battery capacity and picked up the Batwing awning and full-body paint along the way.
Vehicle Platform and Base Specs
The Sprinter 3500 under this EKKO runs a 2.0L four-cylinder turbo diesel making 168 horsepower and 332 lb-ft of torque, paired to a 9-speed automatic transmission. Towing capacity is rated at 5,000 lbs, so a small trailer or car hauler is on the table. The 23B rolls on BFGoodrich KO3 tires, which come standard on the 2026 models, and they fit the all-wheel drive platform well. Mercedes also builds in a step on the front of the chassis, useful for anyone who needs to reach the windshield on a vehicle this tall.
The cab comes loaded with safety tech: adaptive cruise control, active lane keeping assist, active brake assist, blind spot assistance, and traffic sign assist, which reads speed limit signs and posts them on the dash. Rain-sensing wipers, auto climate control for the cab, and an automatic diesel fuel station search when you hit reserve round out the driver features. Both front seats are powered, heated, memory-equipped swivel seats, and there’s a heated steering wheel.
Electrical System
This unit was optioned with the double battery package and no generator. Standard EKKO spec is 320 amp hours of lithium and a 2,500-watt propane generator. Without the generator, that first bay goes to a 640 amp hour Lithics lithium battery bank instead. On the roof, there are 530 watts of solar across three panels, and a solar expansion port on the exterior if more is needed later. The inverter is a 2,000-watt Xantrex unit. That’s 640 amp hours in the bank, 530 watts coming in from the roof, and a 2,000-watt inverter pushing it out, so running out of power without shore power or a generator would take some doing as long as the sun cooperates.
Shore power is 30-amp, with a smart meter that checks ground and neutral and blinks red if there’s a problem with the source before any damage gets done to the coach.
Water and Waste
Fresh water capacity is 50 gallons and gray is 51 gallons. Both tanks are located inside the cab rather than underneath, which is part of what makes this coach functional in cold weather. Because the gray tanks are up in the cab, a pump with a water sensor handles moving gray water from the shower and sinks back to the tanks automatically.
There’s no black tank. The toilet is a 5-gallon cassette unit that pulls out of its bay, and emptying it is a matter of turning a valve and unscrewing the cap. Any pit toilet at a national forest or national park works for dumping, which is a real advantage over having to find a campground with a dump station.
The wet bay has hot and cold water connections for an outdoor shower, a gravity fill port, and all the freshwater valves in one place. Water filtration is under the kitchen sink.
Kitchen
The kitchen runs on induction rather than propane. The two-burner induction cooktop stores in a compartment and plugs into the 110 outlets on the counter. A countertop extension panel slides out and latches to give a bit more prep space. The sink is a deep stainless unit, and above it is a convection microwave, which is specific to the Sprinter-based EKKO. The Ford Transit version of the EKKO gets a standard microwave. The refrigerator is a full-size unit with a chest freezer above it, roughly 14 inches deep, enough for some frozen meat or a pint of ice cream. A roof access port is built into the cabinet above the refrigerator, so running a cable for a Starlink Mini or similar antenna is straightforward.
Cabinet shelves throughout are adjustable and felted on the bottom to cut down on rattle on the road.
Bathroom
The bathroom is a wet bath that manages to feel more spacious than most. In its standard configuration, it’s set up with the toilet and sink accessible. To shower, a movable wall panel slides over to open up the basin. According to the salesperson, there’s enough room for a 6-foot person to stand, turn around, and not feel cramped. A shower curtain on a track keeps the water contained. The showerhead is Winnebago’s Oxygenic unit, which injects air into the line to boost perceived water pressure, and has a shutoff switch on the head itself to make it easy to conserve water mid-shower.
Sleeping and Living Area
The rear bedroom can be configured two ways. In the twin configuration, two separate mattresses sit on individual platforms with a hard plastic nightstand piece between them that has built-in cup holders. Flip that piece over and the two platforms become one continuous bed that’s described as larger than a queen, with sleeping running east to west. Both platforms hinge up on gas struts for top-loading storage underneath. On the passenger side, there’s a hidden compartment behind the bed platform, not visible unless you know to look for it.
The bed platforms use a Frolley springs system rather than a solid base, which keeps air circulating underneath to discourage mold and adds some give under the mattress.
Overhead cabinets at the rear have felt-lined shelves. Nightstand lights on either side have two settings, standard warm light or blue light for reading without disturbing a sleeping partner. Two 110 outlets and both USB-A and USB-C charging ports are at the head of the bed, with a drop-through port for running cables down to the platform.
In the living area, the 23B has two opposing seats with swivel front seats that can face in. A table mounts on a central post and seats about five adults. That same table drops down into supports on either side of the seating to convert the space into a twin bed running the length of the coach. One side of the seating converts to a forward-facing three-point harness position and doubles as a workstation with a fold-up table.
Climate and Insulation
The Truma Varo propane furnace and the 13,500 BTU ducted air conditioner both run ducted to the bedroom, so vents can be closed up front and all the heating or cooling directed to the sleeping area. The EKKO’s gray and fresh tanks being inside the coach is part of the all-season strategy, along with the heated and insulated exterior bays with roughly 1.5-inch-thick doors cut from the sidewalls.
The weakest insulation point is the Mercedes cab itself, with single-pane glass versus the double-pane acrylic windows in the living area. An insulated curtain with snap clips stores in the bedroom and seals off the cab entirely, which helps both with temperature management while camping and with letting the chassis climate system handle just the cab while driving.
Exterior and Storage
The EKKO 23B has about 65 cubic feet of exterior storage total, and a big portion of that is the rear gear garage. The garage has E-track on the floor for securing bikes, containers, or anything else that shouldn’t slide around. Both side doors open to the side and the rear door lifts on gas struts, giving some overhead cover in rain or snow. MOLLE panels on the inside of both side doors let you clip carabiners and hang helmets, ropes, or other gear rather than just piling it in. Both sides of the garage have 110 outlets and a light, and the garage is heated.
Propane comes from two standard 20-pound swappable cylinders, the same type used for backyard grills, picked up at any hardware store. Those feed the Truma AquaGo continuous hot water heater and the Truma Varo furnace. A quick-connect fitting on the exterior lets you tap the propane tanks for a camp stove or grill. The propane bay is the only exterior bay that doesn’t lock and isn’t heated, for obvious ventilation and fire code reasons.
Two 110 outlets are on the exterior campside wall, along with a cable TV hookup. A ladder on the rear gives roof access for cleaning the solar panels.
This unit was optioned with the full-body Serenite paint, which color-matches the body to the Mercedes cab. Standard spec is a white box with a green or brown decal. The Carefree campside awning with an integrated LED light strip is standard on all EKKOs. The Batwing awning on this unit is an option, and it covers about 270 degrees around the coach, stakes to the ground at each corner, and connects at the rear corner of the garage.
The entertainment package, also an option, includes a TV mount and a Bluetooth soundbar. The rear wall has built-in supports for a TV on the driver’s side of the bed platform.
Final Thoughts
The EKKO 23B is a well-sorted package for someone who wants to get off-grid in a self-contained unit without towing anything. The doubled battery and no-generator setup on this particular unit makes sense if you’re in sunny country and want to keep things quiet. It’s a small footprint for what it includes.