I guess the T's you have seen prefer to assemble/disassemble quickly, and face the extra maintenance replacing worn web-loops.
Many weekend warriors have tramps with glass-rods, like the ones on the A-cat pictured. Then you have to thread the lacing every time, and that takes some extra time (or leave the rods in the tramps, and have a really large trailer ). If you want to convert your tramp, it is a 20 minute job for a sailmaker, or you can do it with materials from sailrite and a domestic sewing machine.

Older T's had trampolines of sailcloth (80's), and the current cloth used is a big improvement (traps less wind).

Mike: Do you remember your source of information about larger masks in the cloth used for trampolines on the T? I think I remember a story about Mich Booth trying such a trampoline on Sydney harbour, but I'm not sure.. I always assumed it was the current material he introduced, and that it had become commonplace by now?