In the past ten years, I've had a
'94 Airstream B-190, an
'01 Born Free 23RK, and now a
'95 Coachmen B19. I don't live in my van, but I spend as much as a couple of months out of the year traveling in it. I've looked at a LOT of vans over the years, and my experience with these three has been extensive.
What you buy should depend on your needs... not your percieved needs, but your actual needs. For example, the Airstream B-190 had a LOT of "wasted space" by an unusable shower/tub/bath, was top heavy and wallowed in turns and in the wind, and was pretty dark inside. It had a 460 in it and was VERY heavy. It got less than 10mpg. The Born Free was larger, of course, and not a "stealth camper" in any sense of the word... but was VERY comfortable. It had the V10 and got about 10 mpg. The Coachmen is on the e250 chassis. It has a toilet inside, but no shower. The rear of the van is a dinette which I use for storage which is VERY useful. It has an outside shower should I need it; I've never used it. It has a 351 V8 rather than the Triton and gets a solid 14mpg. It's on the e250 chassis and is relatively light and airy inside. It isn't top-heavy like the Airstream and doesn't wallow.
Folks look at the Roadtrek with it's three or four seats up-front and center-table and decide that would be wonderful for entertaining friends. They look at the full bath and think about how nice it would be to shower in the morning. The reality for most folks is that they seldom, if ever, entertain IN their van... and that shower stall often gets filled with hanging clothes and other storage items, never to be used as a shower. Those extra seats take up valuable room and cause other actual necessities to be crammed into a much smaller and less-accessible space. As someone mentioned earlier, the floor pan shower drain just lowers the clearance of the van without adding much value. Remember that your van only carries about 10gals of fresh water, and has about the same for the gray tank. If you shower, even doing a Navy shower, you'll end up needing to dump your gray water almost daily. An on-board bath with shower just isn't as practical as it looks at first blush; and there's almost always a truck stop, municipal swimming pool, or campground shower nearby that you can get to when you need one. Absent that, a solar shower is a good accessory, but I've never needed one.
I've found that unless you're a smaller than average AND a particularly lithe individual, overhead bunks are best used either for childrens' accomodations, or in my case, storage. A long side-couch makes for the most comfortable bed for me in a van. At 6'5" I still hang over the Coachmen's couch-bed, but it's do-able. The rear dinette area makes great extra seating for two, and I've carried as many as seven adults in the van when using it as the Family Truckster, but for extended trips with the dogs, I take the cushions out, and the last 4' of van turns into storage for the dogs' crate, tools, a folding bike, bottled water, and other necessities that there's just no other place for on extended trips.
The biggest feature I look for in a van/moho however, is total cost of ownership over the period I own the van. If you spend $25k on a van, have it three years and put 50k miles on it, you're going to lose a fair amount to depreciation. And of course, the newer the van and the more you spend, the more depreciation you'll eat. Depreciation is the largest expense in owning an RV. Fuel expenses are signficant, but the difference in total cost of ownership between a van that gets 9mpg and one that gets 14 mpg is negligible over the time you own the van. I bought the '95 Coachmen last year with 26k original miles on it for $5k. I put another $4k in it in maintenance and repairs. I had the mechanical work done by competent mechanics. I did the coach repair/resto work myself. I can drive this van for about 100k miles in five or six years and still get $5k out of it if I keep it in good condition. With $2.00/gal gas, my total cost of ownership with be about $0.20/mile. That compares to about $2.55/mile for the first year for my '16 Jeep Rubicon Unlimited (according to the Edmond's calculator, and presuming 10k miles the first year.)
Sorry for being so long-winded here... but I hope that'll give you a little better idea of how to sort out what you really need in a coach from the glitz.