You mention head room, but what about bed size? Are you aware that most smaller (and cheaper) RVs have beds that are shorter than the equivalent residential size? For example, many RV queen and king beds are 74" long instead of 80". If the published information just says queen or king and doesn't specify the dimensions, then there's a good chance that it is a shorter bed. I didn't have much success with salespeople knowing the length, either, so I carried a tape measure with me while shopping.
If you're never slept on a short bed, I recommend trying that before buying an RV with one.
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