Ours too is bone stock and I have no problem with any wander. I keep our tires inflated to 95 all around but that may be different for everyone as far as weight goes. Also as mentioned be sure not to overload the rear and take to much weight off the front axle within reason. Another trick if you're are new to driving a motor home is to look further down the road rather than looking down right in front of you. It for some reason gives you a better perception of keeping the rig straight and narrow down the road. Good luck and hope the issue get's resolved.