Outfitter is the only 4-season pop-up truck camper. Full disclosure there is also the XPCamper but while it is indeed an awesome camper it is a whole order of magnitude price wise above even an Outfitter, let alone the lower cost brands.
Outfitter is now building their campers on a true one piece tub that provides more strength and insulation then their previous models and along with their molded one-piece roof makes them virtually leak proof. The 2 roof vents, 10 softwall and 2 hardwall windows allow for a great view and even better ventilation. Out in the desert heat we find that many times the AC isn't needed as long as there is a breeze.
We bought our first Outfitter (a heavily optioned/modified Apex8) back in 2004 and in doing so I was partly responsible for getting Bob to embrace the idea of heavily customized campers over cookie-cutter units. Though such customization doesn't come cheap. In 2007 we upgraded to an Apex9.5 (even more heavily modified) for more room and I also personally think that due to its longer floor it rides more stable in the truck's bed then the Apex8 did.
Prior to buying our first Outfitter in 2004 we had looked hard at several other brands. I initially wanted an Alaskan but there were too many sacrifices involved with no bathroom being the biggest (well they could add one for $2K) plus they make Outfitters look inexpensive. Then we looked at hallmark but they didn't have a basement and weren't interested in doing any modifications what so ever and thus I quickly crossed them off the list. Next up was Northstar and we had actually just left the dealer after touring some and had made up our minds to buy their 850SC model when we got the call from an Outfitter owner to tour his camper. After spending several hours with the owner going over his unit we knew that an Outfitter was the way we would go.
We bought both our campers via email/phone from Southern California and while things got a little rocky it eventually all worked out.
We have taken our Outfitter 4 wheeling in Baja, Utah and the SoCal desert/mountains. I have had quite a few surprised looks from Jeepers when they find us setup at the end of a trail.
I highly recommend the Tundra compressor fridge as it works MUCH better then the standard RV absorption fridges. In our 2007 I even helped Bob design an interior vent for the compressor fridge to avoid the large exterior vents normally employed and it has worked great. I also redesigned the LP-compartment/interior-closet area to accommodate the dual 20lb LP tanks on a slider I wanted.
Bob can pretty much accommodate any modifications desired as long as the exterior shell isn't compromised. Though it doesn't come cheap.
If you have specific questions feel free to ask away.