devb22
+1y
There is no reason to take it down to bare metal, paint is so adhesive these days that all you need to do is give her a good scuff!
When I sprayed my mini, I bought a little bit of Zinc primer and I sprayed a light coat of that in places that would most likely rust, because Zinc eats rust! Then sprayed over the top of it with the regular primer...
You won't have any problems as long as you prep the truck very well...
99% prep and 1% painting
Dev