Finally, I completely rust proofed the entire underside of my MH, it took a good 2 weeks, hell of a job. The MH was rustproof by Monaco but after 12 years, and some driving in snow last year, there was some rust starting to show on the chassis, and I hate rust.
First, I sanded many spots that started to rust, under, in the wheel well, between the wheels, each side of engine, front, back, around doors. Then I treated it with some rust remover to go in depth. I painted it with rust proof red oxide primer and then rust proof black paint.
Let it dried then I sprayed wax type rustproofing on the accessible area and oil type rustproofing in tight hard to reach area.
I also removed all the seals from the cargo doors, sanded the frame, painted it and reinstalled, now all I have to do will be some yearly maintenance.
The job looks preety good, now I can hit the road and not worry as much when I see snow and salt on the road. I will do the oil rust proofing every year.
The only thing I have left is the engine, clean and paint it.
To prevent dirt to get all over, I installed very wide and low mud flap at front and rear wheel. I also installed an extra mud flap to cover about 2/3 of the underside.
Monaco Cayman 34 2003, Cummins 300HP
Bigfoot 2008, 10.4, F350, 2006, Diesel 6.0, Black, 4x4, long box, Air lift, Rancho 9000, Rear sway bar.