Not sure who makes your RV but I contacted Forest River and bought a bag of 1000 screws from them for just a few bucks. This is the screw that Forest River use's everywhere inside and outside the RV. I then replaced any screw that was rusty or missing paint etc. I also ordered replacement plastic vent covers from them and bought cargo door holders from eBay and replaced those as well. It really cleaned up the look of my 5th wheel and I think I only spent 20 to 30 bucks for everything.
You might want to contact the maker of your RV and see what they would charge.
2006 2500HD Chevy 6.0 Gas Ext Cab Short Bed
2004 Flagstaff 8528BHSS 5th Wheel
Dear Wife, One married daughter and one soon to be married daughter plus four dogs