I just finished doing my Montana. Badly oxidized 2005. used Mr. Clean scubbies to remove most oxidation, then bar keepers friend to smooth and remove all remaining oxidation, rinsed, re-rinsed and then rinsed again, then 5 heavy coats of Zep Wet Look Floor sealer. Looks brand new, well... besides the lousy decals Montana put on in 2005.
2012 Ram 2500 4x4 Lariat Longhorn 6.7 CTD HO, Edge Evo CTS, Extreme Tow/Haul brakes, aFePower Diff cover, LL 5000 bags, 285/70R17, Reese Q20 w/slider. 2005 Montana 2955RL w/400w solar, Renogy MPPT, 4 x 6v @ 12VDC (450AH), 3000w Inverter, King VQ4100.