I'm still saving my pennies for an RV, waiting to retire. My family's done car camping since I was four years old. I can be *extremely* picky when it comes to vehicles. I don't know anybody else who watched all of the crash test videos for every model in the class that I was interested in before deciding to buy a car. Unfortunately, that research proved not to be in vain. My car was totaled on the freeway by a distracted driver. I'm OK, so I'm glad and grateful that I did it.
Because I'm so picky, I've spent a long time looking at the ergonomics of RVs for a tall person and have walked through several. The more I've looked, the more I've learned. I've kept a database of RVs for a few years so that I can compare things that are important to me. Here's my list of the ergonomic things that I look at:
1. Effective inside height, if the AC is located above an area where people stand. (The plenum is usually around 3 inches, so it should be subtracted from any height specifications. During walk-throughs, look out for headbanger AC units. The ceiling should also have some sort of soft surface.)
2. The length of the bed and how easy it is to get in and out of the bed. (I need clearance for my legs and knees to swing around. The width of the aisle at the bed end of the coach and the location of the adjacent cabinetry also plays into this.)
3. Whether or not you have to climb over another person to get out of bed. (This is related to #2. It's easy for a small person to quietly slip in and out of bed in a small space, but no so easy for a tall person. The only way to test #2 and #3 this is to try them.)
4. Appliance location. (Some RVs have refrigerators or microwaves under the counter. For undercounter refrigerators, this essentially means that they're on the floor. To get a cold drink, a tall person has to get down on their hands and knees. An undercounter microwave means more bending. Try to get something at the back of either appliance to see what I mean.)
5. Freezer above or freezer below the refrigerator. (I get things out of the fridge more often than the freezer. The fridge should be at a level that doesn't require a lot of bending. Same test as #4.)
6. Obstructions over the bed. (Cabinets, etc., and their distance above the mattress. Subtracted from this distance should be things like bedding, foam pads, etc. Class Bs often have a wardrobe cabinet that sits over one corner of the bed. It should be high enough, and the bed low enough, so that my feet won't get caught underneath. Lay down on the bed and put your feet under the cabinet to test this.)
7. Knee and leg room in the bathroom. (I have to be able to sit comfortably. Try it.)
8. The position of cabinet doors when they're open. (Some aren't near the ceiling when open, posing another head banging hazard. Open one and try to walk by.)
9. No pop-tops. (Pop-tops give more headroom and during the summer, they're great. The problem is that I'd prefer not to have cold air coming through fabric around my head during the cooler or windier parts of the year. I like to camp along the windy, often foggy California coast.)
10. Quality build and good customer service. (To me, this is absolutely critical. Without these, a bargain purchase is no bargain.)
Based on what I've found so far, the vans from Advanced RV fit the bill the best for me, probably because the owner of the company is 6'3" and uses his products. I also like the PleasureWay Plateau models. Your mileage will absolutely vary, due your personal preferences and the length of your legs vs. your torso.