Tung Tounge weight is the amount of weight you can put on yout back bumper if towing a trailer. you should have no problem with 1000 pounds in the back of the blazer. Andrew · 8 years ago. Thumbs up. 0.est Answer: Your SUV is designed for Americans, so you can take 250 lbs and multiply it by the number of seat belts, plus say 200 lbs for their stuff.