My first class A was a whopping 23 feet. The smallest Winnie at that time was all of 19 feet. The chassis underneath was a 1 ton truck. RUV's are mostly a higher tech revisit of the past. That said I concur that they are more marketing than substance. Like my old Class A, little consideration was given to weight, balance, or cargo carrying capacity. I seriously considered changing to one but decided the F53 was a superior chassis to construct a short class on, and they are available. When I was looking I told all the sales folks I wanted all the amenities of a 35 foot class A in 24 feet - without compromise. Naturally - not possible!
Look carefully at how you, or someone you paid, would service or repair the RUV. Basically it becomes the owners problem, and a difficult one.
There is a forum devoted to RUV's. Should be studied carefully. I have a neighbor who had so many issues develop with theirs that they never completed any trip they started and traded it within a year - and their malfunctioning slide extended n it's own on an interstateo as they were delivering it for the trade. But, that's a sample of one, and there are lemons that show up in every brand and model. Like all forums, you have to interpret the posts. Owners with problems are more motivated to post. Some are delighted with their choice.