Arctic fox 990 rocking back and forth

You will need to check your payload ratings, but that truck looks to have a payload of about 3500 pounds depending on options. The Arctic fox 990 is a heavy camper around 5000lbs loaded. On any single wheel truck, it will sway back and forth no matter what extras you put on it to control the sway. the weight of that camper is top heavy. Only way I was able to control the sway on my 990 was to upgrade to a Dually. I don’t even think about sway anymore, it does sway a little but not enough to worry about ,plus I don’t really worry about a blowout/tire failure while hauling that much weight. For me it’s a worry free trip, and that, is worth a lot to me and family!