What Is the Winnebago Solis?

The Winnebago Solis is a Class B+ motorhome built on the Mercedes-Benz Sprinter 3500XD cargo van chassis with a factory wheelbase extension. It sits between a traditional Class B van conversion and a Class C motorhome — larger than a standard cargo van build but more maneuverable than a conventional Class C on a cutaway chassis.

Winnebago introduced the Solis in 2020 and has refined it substantially since. The 2025–2026 model year versions address the primary complaints from early owners: improved insulation, upgraded 12V power management, and better solar integration.

Winnebago Solis Specifications

Spec	Solis 59P	Solis 59PX
Chassis	Mercedes-Benz Sprinter 3500XD	Mercedes-Benz Sprinter 3500XD
Engine	2.0L Turbocharged 4-cyl (170 hp)	2.0L Turbocharged 4-cyl (170 hp)
Overall Length	24 ft 5 in	24 ft 5 in
Interior Height	6 ft 4 in	6 ft 4 in
GVWR	11,030 lb	11,030 lb
Fresh Water	30 gallons	30 gallons
Gray Water	24 gallons	24 gallons
House Battery	200Ah LiFePO4	200Ah LiFePO4
Solar (factory)	200W	200W (expandable)
Sleeping Capacity	2 adults	2 adults + 2 overhead
MSRP (est.)	~$152,000	~$157,000

Floor Plans: 59P vs. 59PX

Solis 59P — The Full-Timer's Choice

The 59P is optimized for couples living or traveling in the van full-time. The rear wet bath and convertible dinette-to-bed setup prioritize adult comfort over sleeping capacity. The workstation — a fold-down desk with 12V and USB outlets — has become one of the most praised features by remote-working full-timers.

Solis 59PX — Added Bunks for Families

The 59PX adds a fold-down overhead bunk above the driver and passenger seats. For occasional family camping trips it works well; as a full-timer for two adults, the 59P's use of that same space for a more functional living area is usually the better call.

The Sprinter Chassis: Biggest Strength and Biggest Concern

The Mercedes-Benz Sprinter 3500XD chassis is the industry benchmark for Class B builds. Its advantages are real:

• Precise steering and confident highway manners at 60–70 mph
• Available all-wheel drive — a significant advantage for boondockers reaching remote campsites
• 14–16 mpg unladen; 12–14 mpg with a loaded 500 lb payload — significantly better than a Class C
• Fits in standard parking spaces and most parking garages (with roof clearance caveats)

The concern: dealership service. Mercedes-Benz dealer coverage for the Sprinter is improving but still uneven outside major metro areas. If you break down in rural Montana, you may wait days for a mobile Sprinter tech. Diesel exhaust fluid (DEF) refills and emissions system maintenance add complexity that a Ford or Ram chassis does not. Know this going in.

Power System: Is 200Ah Enough for Off-Grid?

The factory 200Ah LiFePO4 battery bank and 200W solar panel are genuinely useful for one-night dry camping with conservative usage. But most serious boondockers upgrade within the first season. Running the Truma Combi heater and water heater on propane, keeping two laptops charged, and running the fan overnight will push 100–130Ah per 24-hour cycle in shoulder-season weather.

The most common upgrade path: add 200W of roof solar and a second 100Ah battery. Winnebago built in the wiring provisions — a two-hour job for a competent RV electrician.

Who the Winnebago Solis Is Really For

• Couples who drive and sleep in their RV more than they sit in it. The drivability of a Sprinter van versus a Class C is a genuine daily quality-of-life difference over 10,000+ annual miles.
• Urban and suburban campers who need the RV to fit in a standard parking space and residential garage.
• Remote workers on the road — the workstation, cellular antenna provisions, and quiet interior make the Solis notably better than most Class Bs for productivity.

It is not the right choice for: families of three or more who need real sleeping space; buyers who prioritize kitchen space; anyone who needs a tow vehicle (GVWR limits towing to around 5,000 lb).

Winnebago Solis: Expert Rating

Category	Score (out of 10)	Notes
Build Quality	8.5	Among the best in Class B
Drivability	9.5	The Sprinter chassis is unmatched in the segment
Livability (2 adults)	8.0	Excellent for couples; constrained for tall adults in the wet bath
Off-Grid Capability	7.0	Good foundation; most serious boondockers will upgrade solar and battery
Value for Money	7.5	Premium over comparables, but Winnebago's warranty and dealer network support it

Frequently Asked Questions About the Winnebago Solis

What is the towing capacity of the Winnebago Solis?

The Solis is rated for approximately 5,000 lb towing when equipped with a factory-installed or dealer-fitted receiver hitch. Due to the GVWR limits of the Sprinter 3500XD platform, loaded towing capacity will be lower — always subtract your actual loaded vehicle weight from the GVWR to determine available towing margin.

Does the Winnebago Solis have a full bathroom?

Yes — both the 59P and 59PX feature a wet bath (combined shower and toilet compartment). It is compact but functional. Buyers who prioritize a larger bathroom should consider the Winnebago Navion or a Class C alternative.

How does the Winnebago Solis compare to the Airstream Interstate?

Both use the Sprinter chassis. The Airstream Interstate prioritizes premium interior finishes and brand prestige; the Winnebago Solis offers more practical systems integration (solar, battery, workstation) at a similar price point. The Solis is generally preferred by full-timers; the Interstate skews toward weekend and vacation use.