In reading this site over the years, the criticism of the textured finish that I've seen is that dirt and grime get into the nap of the texture on a finish like that. It becomes very difficult to get it truly clean, and makes the whole camper look much worse than the quality of the actual construction would indicate. You might want to consider developing a smooth final finish.
I did consider it...for about 20 seconds. After witnessing the never ending finishing process, the hundreds of hours of sanding needed and what others go through and still have a flawed finish...well you know. Unless you have unlimited time, buckets of cash and professional equipment, I would suggest any home made product use a textured coating.
Dirt in the texture? Not a problem. If you do it right, power washing should clean it up. If not, then you put another finish coat on every 5 years. It is still preferable to the alternative nightmare.
When I bought my truck, the salesman asked me if I wanted a clear coat to protect the finish ($300). I laughed and said, "It's a truck. I want to off-road it through jungles with rocks flying all over until it looks like a beat up old truck."
I guess I feel the same about the camper finish.
Anyway. If my finish isn't smooth, i won't be tempted to slap on those silly decals.