Hi nuthermug,
Barneys has got the answer - the broom trick is the go. JT showed us how to do it when we picked ours up, it really does make it easy.
I have no trouble putting ours up or pulling it down myself, but it's a lot quicker if you've got a second person (mainly because you don't need to keep walking from one side of the trailer back to the other). I prefer just to potter along at my own speed though, it's certainly not difficult.
When packing up, I don't have a problem pulling the floor back onto the top of the camper by myself - again, it just takes a little longer. Pull up one side as far as you can, then go get the other corner and do the same. Once the majority of it is up, it's really easy to go back and pull it "properly" up and get it sitting perfectly. If you're really concerned, you could attach from rope to the far corner peg eyelets, and use that to pull it over from the back-side, but I've never found it necessary.
This is all on a Trackabout Safari Extenda with the 10" tent - http://www.trackabout.com.au/module.php?module=trailerquote&file=show_camper.php&range_id=8 (ours - http://myswag.org/forum/index.php?topic=8571.0)
The other option is as Speewa says, make a supporting platform so you can rotate your mattress. I can remember seeing a bunch of photos on here a while ago about how people have done the same thing in slightly different ways. I think jcclures has made a similar mode to his new tent? You've still got to deal with the ladder in that case though, and I find that's one of the main benefits of the extenda trailers - the fold-down steps and walkway just make it so easy, which is good for me because I tend not to be able to work ladders after a night around the campfire
.
Personally, I'm not a huge fan of the gas struts on the tent bows, but I've never used them before. I would expect that, if they make setting up easier, you would have to work against them while packing up? Seems like an unnecessary complication to me, which is saying something. That said, the poeple that have them seem to rate them, so my ignorance is probably working against me here.
Good luck - there's a few manufacturers now making the Extenda trailers, and I reckon they're great. You should have no worries getting something to suit your needs!
Good luck!
Matto