Frame failure is not an issue with Catrikes. The bends being on multi-
plains make it even stronger then most steel trikes and if your near
the ocean your frame will be standing long after the steel ones have
rotted. Catrike frames are more ridged and most of your suspension
will be based on your tire selection. I choose 1.75 Schwalbe Marathon
Plus Tires for a flat free and very well sprung ride. Much to consider
for sure but the frame strength is a non issue to be sure. Hope this
helps. Trike on. Included a link to a review of my setup for
reference. http://www.utahtrikes.com/RECENTTRIKE-Tims_Expedition_FL.html