We are on our 2nd Aliner and have found if you have the front lower than the back you’ll get rain draining forward trying to get through the long roof gasket. We had our dinette get wet a few times until we raised the front slightly higher than the back. We are only about an inch higher in the front now but no more rain leakage getting into the front dinette. We’ve had no impact on towing. We did all the measurements for ball height and drawbar drop to be perfectly level but when we lowered the trailer onto the truck we had some drop on the springs we didn’t account for which caused the nose down issue.