I don't think many people have had to warranty them, but frankly Timbersled is a small shop with good customer service, so if you have a genuine problem you'll definitely get a response from Allen the owner, and if it's a design issue i'm sure he'll fix things right up.
Take a look at my "Leaning" thread, in a nutshell, I am running appx 90/140PSI in the shocks, 2nd hole out on limiter, and moved the rear mounting point up 1". I'm a similar weight to you.
This is for a mostly stock sled, if you are running boost you need to ask on the Turbo forums.
Mark