For me-too heavy by about 2000 lbs. I tow a 3000 lb. Focus with our 30 ft. Class C Ford V-10 and I don't sense much reserve left for grades, not to mention the stoping. I had a difficult time sorting out the "tow rating" in the manual but seemed to suggest the MH really isn't built to add much weight. You can't go by what people pull and what you see on the road. Some would tow any thing as long as it will move when you step on the accelerator. It's all about physics; each pound you move takes X amount of energy. Add 1 lb. and it takes more though you won't notice. Add 500 and it takes a lot more.
