We recently purchased two Swedish-style folding cots from LL Bean. ($99 each, free shipping)http://www.llbean.com/llb/shop/33300?feat=504639-GN3
It's really more of a bed than a cot. We currently have two set up in our living room. We wanted to make sure they were comfortable and it turns out they're so
comfortable, we just keep lounging in them. The dogs seem to like them as well.
They don't have stick-style legs, instead there are three "U"s that are the width of the cot, so the weight is evenly distributed. I don't have any concerns about damaging the tent floor.
They come with a mattress that would be sufficient, but since we already have Thermarest DreamTime pads, we just put those on top and holy crap it's super comfortable.
I don't know the technical weight rating, but I've slept in mine a few nights with our two dogs (total weight = 280) and even with the dogs hopping on and off all night, the cot held up just fine.
I find it's very
easy to get in and out of the cot - it's very solid and steady. I'm really looking forward to being able to sit on the edge of the cot to pull on socks and shoes while at festival.