Hello rvfixr and welcome to iRV2.com. We are glad to have you join us here. I am sure you will enjoy the website and forums. This is a great place for lots of info. We need to know the year and model of your Coachmen motohome. Also more description of where and how the floor is weak. Do you feel a strong seam like a floor joist anywhere? Good luck and keep us posted.
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