I have a 2wd 2nd gen 3500 Dodge with cummins and Michelin ltx tires, when I first bought the truck 8 years ago I found the truck steered good without the camper but with the camper it would wander a bit when the road had sways or ruts, made me a little nervous on narrow roads, it really kept me on the bit making corrections. I went through the entire steering system top to bottom and tried different tires but everything remained the same. After sometime on some Dodge forums I found that the frame where steering box mounts to is on the weak side and tend to flex a little bit. The fix or band aid that I found that helped my truck a lot was the steering box stabilizer brace, here is a link to it, there are other less cost versions on ebay. https://www.xtremediesel.com/BD-Power-1032004-Steering-Box-Stabilizer.aspx
