I am towing a grand design with similar weights. Fortunately, there’s only 3 of us and the other 2 are light females. I had a major issue with the tail wagging the dog starting at 55mph. I was using a recurve r3 hitch 1000lb and upgraded to and 1200lb equalizer and all issues resolved. Pulls great at any speed.
I’d seriously question your choice of hitch. I think 1000lb bars are too small for 800lb + tongue weights. Equalizer even states their 1200lb bars are for 800-1200 lbs.
My point is really just to say if you tow it and it doesn’t feel good, try another hitch or heavier bars. I also have a hellwig swaybar and E rated tires. It might be fine, but don’t be discouraged if not. It can work with the right. But i do agree with others. 4 full size adults probably uses most of your payload before even hitching up.
Put everyone in a diet
Though I’ve corrected my immediate issue with a better hitch, I’ve already placed my order for a 1 ton truck. I’ll probably get a bigger rv, so I’m getting prepared.