Thanks, Jbernier! A Hobie dealer is getting a set of 48000001 "Custom molded for the H20 hull, fits al Hobies but the Hobie 21/Fox/Tiger...rear cradles include tilt bracket...".
The description proscribes use with the Tiger, but I plan to build up the bottom of the cradle with layers of carpet held by shock cord so that the weight will rest primarily on the bottom of the hulls & cradles, with a small gap or very light contact on the sides. Of course, I will have to slide the rear cradle along the hull from front to rear to make sure that the cradles don't pinch the hulls while sliding the boat on & off the trailer.
I initially rejected the above cradles because the Tiger is excluded in the catalog description, and because they pinch the hulls a bit toward the bottom, so that there is a small gap (~1/8 inch) between the very bottom of the hull and the cradle. I suspect that is the reason why their use is now proscribed for the Tiger; that the pinching either caused the cradles to crack, or worse, made dents in the hulls. I understand that the Tiger was not excluded in previous editions of the Hobie catalog. Also, the dealer says that the above cradles are (or were) used with the Hobie-sponsored Tigers. If anyone knows for certain why theHobie catalog excludes these cradles for use with the Tiger, I'd be interested.
I guess a more elegant modification would be to strip the carpet off the bottom of the cradles, build them up with Bondo (or similar) molded to the shape of the hull, then re-carpet. But, realistically, if the layers of carpet work okay, I'll never take the time to do anything else, except maybe glue the carpet layers on.
So, if anyone can see any flaws in the above approach, please let me know! Otherwise, I'll just tell the forum how it works out.