The short bed/standard bed is the same thing and 6" long. The long bed is 7" long, 6" longer on each side of the wheel well than a standard bed. The long beds are less common, at least up here in AK. I think I have seen a 4cyl x-cab long bed once.
I am sure it would not be too hard to find a toper for a long bed if you are shopping new, used may be harder.
I am talking 1989-1995 pu here but I think first gen Tacoma's are the same, I know the short bed is at least, and this probably holds true for early pickups too.
I think the only 8' bed I have seen is on an early 1982 long bed pickup, but it may have been 7'. You probably have to go to a new full size to get an 8' bed.
If you can afford one the newer Tacoma's are really nice and bigger than the hilux and gen 1 Tacoma's.
You could always sleep at an angle in a standard bed PU.
You may be better off building a bed and drawers for you Land cruiser and sleeping in that. Check out the expedition section for more ideas on this.
I will post a picture of my sleeping set up in the pack of my truck soon. For now here is my fishing rig to make you jellos.