Well I painted mine with ICI DEVOE about 6 weeks ago, and so far so good!!
Depending on how much you want to spend. It cost me just under $100 for my paint, and it is tintable to any color you want.
I did 3 coats and used no primer. I also used a foam roller to lay the paint and did a lot of sanding prior to the paint.
The paint is VERY VERY EASY to work with.
As for durability...etc, the paint guy at ICI assured me that this was an industrial paint and would last for years. It is designed for uses on heavy machinery were a lot of oil and grease may be present and it won't affect the paint.
I just came back from a camping trip this past weekend were the gravel road was narrow and there was some heavy bush on the sides of the road. My boler
brushed up against the bush several times while going about 70km/h. When I got home, I washed it down with my pressure washer. No scratches and still looks like a fresh paint job.
Just in my opinion, if you plan to use your camper as a camper, as I do ( small children, gravel roads and thick bush ), then I would go with ICI DEVOE because of its price, application and durability. I'd hate to spend a alot of money on a pro paint job, only to scuff it up after a few trips.
If you plan to use your camper as a show piece or for light
camping, no children, paved hiways and fancy campgrounds with high speed internet..etc, then go for a high end paint job.
If I still have my boler in 20 years, it and I will be over 50 years old. Then I will restore it with all the essential goodies!....
1974 BOLER 1300: THE TANK