by TJinPgh » Sun Mar 11, 2012 2:31 am
Ultimately, it's going to depend on your design.
If you are doing a design where the entire back opens up like the pic schaney posted, then, yes, I guess it's possible that you could get more dust inside simply by virtue of the opening being larger.
Other than that, though? More often than not, trailers with a rear door have a vertical wall in the back. So, the process of building a door in that is no different than building one on the side.
It will need to be sealed the same way, no matter where you place it. So, there's no reason to think that dust or water or whatever would be a greater concern in one over the other.
At least, I can't see why it would be.
Those who have built them can feel free to correct me, though, if I'm wrong.
Do you have a profile you're thinking about?
If so, put up a pic and we can get a better idea of what you're thinking.
-TJ