From my experience, I would not be comfortable in any camper that could go on SRW truck.
We spend 5 months in our 12-footer in year 2017, when we sold the house and now we left 3 weeks ago for 3 months trip to Alaska.
Our Fleetwood is wide, basement model with plenty of storage, so we are carrying hammocks with steel frame, 3 cases of beer, 3 cases of bottled water, summer and winter clothing, dog food and dog supplies, still having lot of storage left.
In the past we used 12-foot Lance and I could not figure out why Lance is less comfortable beside not being basement model.
Finally compared that Lance is 3-4" narrower than Fleetwood. That 3" converted shower from one where I constantly had curtain on my back (regardless modifying the rail) to one where I can turn comfortably.