My 50 pickup cab sits noticeably lower on the right (passenger) side but I'm sure it is from the floor board being rotted out in front of the cab mount. That corner is sagging/drooping down and the cab mount is now a high spot in the floor. You can see it looking straight at the front. The grill is unlevel. The frame is level as good as I can measure. I'm trying to figure out how to jack/raise it up level to make the repair.