frogman,
Dealing with each of your points in turn:
1. Easy fold out tent - the trick here is to stay with units that have the internal bows which constitute the tent frame pivoting from the central point on the bed base. Steer clear of any tents where there are free standing bows that you need to pull off the camper and place on the floor - I've had one of these and whilst they are fine once erected they are a real pain to put up. Anything longer than 9ft will require additional support beyond the three bows, and in the case of trackabout and customline this is achieved through an additional bow that is suspended from the top of the third bow and is erected by putting a couple of single poles underneath to support it. That's a pretty crappy explanation - you'll need to inspect one of the units to see what I mean. Moral of the story - steer clear of free standing bows.
2. You can get stainless kitchens from most suppliers or buy one after market if you can't get what you want. Again, Trackabout will have you covered nicely here as will Jimboomba.
3. Clothing storage - not sure how many clothes you want to take camping, but there are a few options. A number of units have slide out draws that can be accessed from inside the tent, or Drfita makes a draw that is the full length of the trailer that slides out from the tailgate. Again, lots of options here, and these will be specific to the supplier.
4. Offroad ability - Again this depends on how hard core you're going to get, but the suppliers I've mentioned all make good off-road units. Customline from what I have seen is probably the least capable off-road, but again you would have to push it pretty hard to find it's limits and there are plenty of people on myswag that have taken customlines to some pretty remote locations. Trackabout make well constructed trailers on full chassis with triple drawbars and large tyres and oz-hitch couplings. If you are a serious off-roader then it would pay to do your own research here, but if you just want something capable of getting to Frazer / the cape / Kimberley then all of these trailers will get you there in comfort.
5. Bed that you don't have to climb over someone to get out of - obviously you need clear access from both sides of the bed and this would normally be achieved through an extended trailer that has a passage way at the end of the bed base. A number of manufacturers make these units now with a step that folds down into the soft floor area so there is no ladder to climb down in the middle of the night. As a soft floor camper owner with small kids I can really see the value in this option and if I had my time again I would seriously consider it. Trackabout and Jimboomba have these units - not sure about Customline.
Hope this helps.
Petermac.