Judy,
I understand.
At 6'-2 I like to stretch out as well. In a regular tear with the mattress as the floor, not much you can do other than lay down, or sit up slightly.
In the Cabin car (my design at least) the bed is on a platform, much like a bed at home. The floor is "dropped" or recessed 3.5"
These things combined allow you to sit straight up with your feet on the floor.
Standing straight up isn't possible, it is more a bent position, but if you chart the amount of time you sit, as opposed to stand while inside a camper, you'll find that 90+ percent is spent sitting, not standing (this doesn't count sleeping).
As with most things in life, camping is a matter of personal compromises!
I really like having the extra floor space, and the bathroom.
I can stand up outside
Rob

Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...