The tires are 225/75R15's. I am no where near a scale so I will have to look for one while on our trip. Im going to run the tires at 65psi which will give me 10,160lbs of tire, my max weight is 11k lbs. factoring in the tounge weight of 15% the axels should only see roughly 9,350lbs at max weight.
Good news is I pack very light, I have gotten rid on all my wood blocks and replaced them with Lynx blocks and went through and got rid of a bunch of stuff I dont need in the TH. We also travel with very little water (we fill up as close to our destination as possible). If I were to guess we probably come close to 8-9k lbs fully loaded with our "stuff", including the bikes.