I use the Arctic fox 990 and it's perfect for me, single... one slide out does make a big difference, 2 slides would be too much for one person. While nice, just not needed.
Sort of depends on what you want to do with it, where you plan on going, like RV Parks ( I know, but had to include it, right) Boonie camping, Full time or just occasional trips.. 3 or 4 season insulation etc... Towing something, Stinger hitching length ..
Then what will the truck handle comfortably..
It's a process, heheh, to be sure...
Good luck..
Ps, the smaller the footprint, not towing, the more spaces you'll fit as you undoubtedly know.. with the previous rig..