It took me a while to realize that having a floor in a portable is really not necessary or desirable, especially at the cost of so much weight and size (storage, transportation, etc).
I carry some small mats for inside the 6000 for setting stuff on, but like having the ability to drill holes anywhere, not have ice snow
build up on the floor when it's time to pack up. My boots keep my feet dry and warm. I carry a couple of folding chairs in my jet sled.
The chairs and shelter weigh less than the 4000, and take up less space in my JetSled XL. I was also carrying two chairs with the
3000 and 4000 so my weight reduction really is the difference between the 4000 and the 6000.
I didn't like the skis on the 4000 (too flimsy). And I always put the 3000 on top of my jetsled which made getting at my gear a hassel
(unless I was setting up the 3000). I built a sled using skis and roof racks, but only used that once for the 4000. It is hard to
carry stuff on top of the 3000 or 4000--at least when pulling behind a snowmobile. Things fall off, get covered with snow etc.
I prefer using my jet sled (with a cover) and my 6000 inside the sled (packed at the bottom or near bottom) so I can stop, drill, fish
a few holes before committing to setting up camp, and yes, the 6000 is not as mobile as say a Rover or Yukon or whatever....
MD