I'm new to the forum starting today. My situation is similar to VAredRAM's except that I have an '09 Ram 3500HD 4WD SRW pickup. I made an assumption that I'd be able to carry the AF990 w/o any issues...
When I picked up my Lance 855 on a Dodge DRW I had the same problem. My wife was terrified we were going to tip over. The problem was tire pressure. Air them up to 80 and no more problems.