This looks like the most likely place to ask a few questions. I have a race car trailer and I want to put a roof A/C on myself. Question1: Are the roof vent holes on most trailers a standard 14"X 14" as required for the A/C. The trailer is already wired for A/C so I'm guessing this is the case,but thought I'd ask. Question2: If anyone has done this themselves before, do you know of any tips I should be aware of before I climb up on the roof? Thanks in advance.