hi! last year I modded my 2002 rockwood 1620, 31inch tires and soa lift... I'm planning to add some shocks any one have any experience with those : https://www.etrailer.com/Trailer-Suspension/Lippert-Components/LC281255.html ? I'm also planning to change the leaf, for prevention, my current leaf have 2 leaf should I put some with 4 like this one ? : https://www.etrailer.com/Trailer-Suspension/Universal-Group/SP-124275.html or should I put some 4000lbs ? I offroad with the popup.. any suggestion??