Chevyman, welcome to iRV2, we are glad to have you join us here. We look forward to reading of your adventures and experiences. If it is not leaking then I would not try to tighten it unless I thought that I really should; only you can make that call. I would try to first find out the torque setting of the bolts on the flange, loosen them and then retighten to that torque. You may want to pre soak with penetrating oil if the bolts are rusted but otherwise just leave it like it is. Good luck and enjoy the website and forum.
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