Queen will fit, I use the king because that's what we have at our house! I do use queen also on the bed they will be snug but will not come off when you sleep (I know this because I'm a sleep mover!) If you do decide to get some king, find some at a discount store, they will be seconds but it will save you some money, as you will discover there is no end to what you can buy for the camper!
If you have extra stuff at home don't go out and buy new! Its easier to store things in the camper than you realize!
We are going to use our dinnerware and take out the plastic stuff we have (we're tired of eating on plastic!) We also have half of our REAL silverware in the camper, it's so nice to use a real fork instead of plastic or dollar store silverware LOL (I think they purposely bend the tines on them before shipping!)
ok I guess I've rambled enough.... good luck in you new venture! I'm excited for you both!