Have a short bed (6'6") RAM. I can't see the hitch in the bed when hooking up, but, then again, I couldn't see the hitch when I had a bumper pull or the curb when I'm trying to parallel park. Like anything else concerning the vehicles "spatial relationship" to things around it, you learn where things are. The hitch pin is in the middle of the nose, on mine protruding about 10", the hitch itself, is in the middle of the bed and to make it a bit easier, the hitch plate even has an angled opening allowing for a certain amount of "off center". As others have mentioned, it becomes easier the longer you do it, and the height will give you more problems than alignment. I finally broke down and bought a "hitching level" and even hitch height has gotten easier with it. The DW enjoys "helping", so, I let her "guide" me with the two way radio, but, I'm usually already making "course corrections" before she says anything. After almost 43 years, I still enjoy her company and her voice and she feels she's contributing to the RV "work". We both pitch in and help each other with our "primary" responsibilities, so, it is all good.
Fuel tank? Can't speak to the GM and Fords, but, the SB RAMs have a 34 gallon tank. More than adequate for my short days, but, I carry two 5 gallon cans of diesel for "just in case" or when we are off roading after unhooking and we are out in those areas where the GPS just goes blank...
As already mentioned. Get what will work for you, not what works for me. I prefer working on my truck in the garage, a LB won't fit. My DW won't touch a LB, she will drive the SB if it is the only horse left in the stable. I sometimes prefer parking closer to the store (I have RA and walking some days is a chore) and the SB will fit, barely, in a regular space. I can haul 8' with the tailgate down and I don't need the additional hauling room while towing because I don't have the additional load rating to make it worthwhile and I have unused storage space in the 5er for extra "stuff" if I need it.
That's why I have a SB...not, necessarily, why you should have one :)