I would first make sure the coach is level and not in a stress parked condition. Check to be sure all hinge side screws are tight and door is hanging plumb and square to frame. Make adjustment to the striker as need to allow door to close more easily. Once you have it the way you want it, you will need to est drive it to be sure it is tight enough not to allow any wind noise or rattling. Good luck and let us know how it turns out.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7