I see, well not really much to break there and if you go to 37's you are going to want to look at a different system anyway. I have the Mopar Reinforcement and Tire Relocation Kit on mine and heavy 35's or light 37's are at the limit of what it can support. Do not read this as "about to break", read it as it can sag over time and it can rattle--both are nuisances versus anything major happening.Warranty. If I go with 35s or 37s and they say you overloaded the mount, tailgate, or hinges. I just want a written document with their limits. I am sure if something breaks and I request a warranty fix they will find the documentation.
Depending on the 35" tires you may run, you will likely be OK with a Mopar kit. If you a looking to go to 37's, I would be looking an an aftermarket carrier and support like one of these mentioned in this thread: