The Hobie 18 and Hobie 16 have fundamentally different shock cord arrangements for the trapeze.

The 16's shock cords run underneath the trampoline from one trapeze to the other, not under the deck lip like the 18.

No trapeze return system is designed to prevent you from taking a trip around the forestay in a pitchpole. That's what footstraps are for (besides breaking ankles). You have to hope there is enough stretch in the return system that nothing breaks .

Go to The Hobie 16 Worlds Photos and look at some of the beach pictures. You can clearly see what we were using on our trapeze set ups.

The righting lines we used were simple lengths of line, tied to the dolphin striker and stuffed into the pouch on the tramp. When you flip, you pull out the line, toss it over the upper hull, right the boat, then stuff it back in. Simple, cheap, and very effective.