I love my queen size Aerobed. I've been using it for camping for several years now. The only caveat is that you need a 110v source to work the built in inflator/deflator. I use one of these:

It's works as an invertor (boosts 12v to 110v) jump starter, light, compressor, and inflator. I got it at Sears for around $100.
Dunno much about 3 room tents. I've never owned one that big.