Bob,, its just an idea but what about something along the lines of a rod holder used in a boat except a bit larger to fit the pipe,, mount that on the side or top where it is accessable and carry your frame piping strapped to the outside rather than clutter up the inside,, some type of velcro straps, or bungie straps to hold the pipe in place while ya flying down the highway,, heck even an older snow ski rack with the rubber cut out slightely to allow the pipe to slide in, then clamp closed,,,
just a couple of DIY things that would be inexpensive and eliminate the need for more access in the rear of the TTT,
chipper
