Reality Check wrote:
I guess I'm not really understanding the problem. Pictures? Fuel lines are easy to move. Jacks should clear regardless. Worst case, rear of the camper (anything past the 8' mark) might have a section/part that is lower (i.e. our wings hang down about 1/2" lower than the bottom of the camper). Just put the camper on a mat, or plywood, etc, to raise it up a bit.
I'm not following why the narrowing at the rear? Deck at the back would work great..we use to have a pull out deck that stored under part of the flatbed on another truck.
The big campers have a drop-down in back where they extend past a standard pickup bed.
The big campers are already tall in a pickup truck, and will be even taller on a flatbed. You have to plan routes VERY carefully to avoid low bridges without making it even taller. Get over 13'6" and you're going to have problems even on main roads and interstates. Besides a stall mat is not going to raise the camper enough to clear the rear drop-down on some of these campers.
Narrowing at the rear to clear the cleanouts and rear jacks. A flatbed is as wide as dually fenders.