Try one at least 40' long with 4, 5 slides out,

You will have enough space and amenities. You will have a big kitchen , all applances including dish washer, washer and dryer, nice size bedroom and bathroom.  Like regular houses, RVs have different brand, size , quality , with different price tag. If comfort is the only concern,  people can always choose bigger, high quality  luxury RVs. If a million $$ one is still not comfortable,   you still can order a customized one.

Ours is 43 feet long with 1.5 bathrooms , plus washer and dryer.  This is our 2nd year  full-time living in it and traveling  to see the country. After having visited 25 states,  20 some national parks, many state parks,  and many many cities and towns,  we still love our RV and this incredible lifestyle. .