I have done it on the interstate and would not recommend it. If a large truck comes up behind you very close, that is enough to lose control. That is if you are going over 50mph. Up to 40mph it feels good, so stay on the side roads where you can keep your speed down. Interstate speeds are too high even if you go only 50-55. If you try it you will feel very unsafe and know first hand what I'm talking about. Rear wheels on your towing M1009 won't want to stay where they should when your speed is up, they get very loose. I was using a med towbar. If you have any tight curves especially downhill ones, the towed M1009 will definately push you and you can't take much of that, go very slow. You need a good feel for the road so don't let yourself get surprised, take it very easy.
Greg