@GONOVRIT can probably give some insight. Pretty sure he has gone through the different stages all mentioned here.
To elaborate on what I said earlier, Storage. I have yet to see a truck bed camper, let alone one that will fit in a Tundra, have enough storage for a hunting/fishing trip that would last more than a weekend. Even my long weekend trips to deer/turkey camp I have at least the following:
1 gun case or bow case
1 duffel of gear
1 small bag of camp clothes
1 Igloo IMX 70 Cooler
1 Border Collie w/ corresponding bag of food and treats
Gear in the bed, dog in the back seat, SxS on the trailer out back.
All of that would probably fill the floorboards of a truck bed camper for a Tundra in order to leave enough room for the dogs in the back seat and not have the cab cramped with gear for a drive. Add in another human, gear and dog and its super cramped. Then you have to unload it all to fit the two people/dogs in the camper once its set up. Also a hassle to load/unload stuff up if you need to run to town. With the camper shell that has contractor windows and a decked style drawer system everything is organized. You can access everything from the sides and the tailgate. Use rubbermaid containers to organize like items. I would normally make fun of just about everyone that rocks a RTT, however for backcountry hunting/fishing and maximizing the space in the truck without having to sleep on the ground they actually do make sense plus not having to pack the tent and gear inside the camper shell frees up more space. It is relatively easy to set up and take down. Important because how many times have you forgotten to unpack that wet tent at the end of a trip? I have a few of those t-shirts over the years. Get home, flip the thing open and let it dry out while you're at work the next day wishing you were still hunting/fishing/not at work. Its trendy too so maybe the wife will be ok with that and the dogs sleeping in the camper shell. Heat, meh. If you have the proper gear this wont be an issue and lets be real, is the wife REALLY going to go with you when its cold enough for this to be of any concern? Probably not. Also, I'll assume the Tundra has a stubby bed that cant haul a sheet of plywood. So unless you, your wife or your Brokeback adventure partner are the size of Peter Dinkledge, sleeping in that thing is probably going to suck. For the dogs, I am sure it will be fine.