
I have a 23u, about 24'10" as someone stated. Previous to thus I had a 40 ft diesel funmover. B4 that, 5th wheel toyhauler, diesel truck. I bought this 23u BECAUSE it had no slide outs, so no slide out issues. Been there, done that. I adjusted the caster to the max on alignment, added a heavy duty torsion bar to the rear. Really helped in the wind.
My model is on a e450 chassis, 2017. I wanted more truck in case I needed it. That said, I'm an avid dirt biker/dual sport rider. With this setup I carry a load on the hitch of less than 500 lbs with gas can for short trips, or tow a jeep and hang a bike off that for longer trips. I store a sea eagle kayak in the cargo bay along with spares, tools, tires, etc. Always travel with water full. Always. Never know if where I go has water. I get 8.4 to 9.6 without towing and 8.1 to 8.5 towing. Eh. Is what it is.
It's proven tough enough to take the occasional dirt roads, foul weather. The box structure is stronger without the slide out holes. It's very handy to drive. Another consideration for me is there are thousands of high mileage Thor basic 23u models out over 100k miles in the rental business getting abused. If the product can take that, it can take me. Fwiw I'd step up and get the 23u instead of the 22 model. Might not seem like much but that barrel chair makes a big difference on your back moving to chairs if stuck in during rain!