Chalking the tires is defiantly the best way. When my 33's were installed, the installer wanted to pump them up to 50 psi, even tho BFG states on the tire sticker not to ever exceed 40, even when installing! I told them to go to 32, and they did, even tho they didn't understand why I would want under inflated tires. My 33's are at 29 BTW.
Enjoy your new meats