that would be a lot of tonque weight but not really hard for the tires to see that much weight. you still have all the weight of the rear end of the truck to add as well. i know i've had about at least 3k lbs of tonque weight on my truck when pulling a goosneck trailer w/ a truck all the way on the front of the trailer (had to fit 2 trucks on the short trailer). i'm not sure how much the drive axle of my truck weights but i know its 7500 total. but then again, you have twice as many tires back there as i do so i know you'll be able to set more weight there than i can.