I hand sanded (which is what you should do if you choose to sand) my entire trailer beginning with 600 grit and working through 800, 1200, 2000. Then I used Nuvite F9, F7, C, and finally S with a cyclo polisher. My Bambi II sat in the woods for 20 years, so was very pitted. It's still not perfect, but it's not going to get any better than it is. If I were you, I'd start a small section with 1200 black wet sand paper (you get it at automotive paint stores) first & see if it comes off. I'm pretty sure the 2000 can be skipped if you use F9. F7 might even take the scuffing off. I also used this method on the end caps of a 1986 AS Sovereign
. They kind of had an orange peel effect and this method took away the bumpy look.