I don't think a 1000 Gal hot tub (about 8800 lbsloaded) would put a damper on your truck.
My truck build is kinda odd. 10K front axle (empty weight 5500 lbs) My new air ride Rear axle is rated at 20K (curb weight about 8000 lbs right now) And this is just a single rear axle truck. So you can see I can add just about anything I could ever want and not over load my vehicle.
Total weight Truck trailer and Jeep in the below pic is about 20K
