Home built vs Mass produced question

[Ballenxj]

Does anyone have any experience with their homebuilt rig and getting into private campgrounds?  Do some allow them, none allow them or just luck of the draw?  
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  Planning on doing a cargo trailer build out and now that there are some mass produced ones that look like cargo trailers I think I could add some decals to it and no one would second guess it.

 This is a good question to which I'm interested in hearing everybody's answers. RoTXP brings up a good point about window mount A/C's. 
 From what I've seen, a good homebuilt by somebody that knows what they're doing is far better than the average factory built TT. With RV roof air conditioners weighing in the neighborhood of 100 lbs, you would want to insure the roof was beefed up enough to handle it, but sounds like a good way to go. 
PS, I like the decal idea. You could possibly get creative if you find a company willing to make custom ones.