Originally Posted by TimR
What is and where did you find the spacer to go on top of the trailer? I'm having a heck of a time finding one and FF wants a lot for shipping!
The spacers I used where custom fabricated polyurethane. I think there's a hread on that part of the project if you search around for it. Found a plastics shop with a nice CAD/CAM system. I took them my Fantastic Fan and a basic plan I had sketched out. Was not cheap. I think about $300 with the materials. But the added head room is worth it!
I got the version of the FF for thick roofs with the highest lift, but custom spacers of some type will be needed.
If I had to do it again I would not have used polyurethane. I'd want something lighter and more compatible with adhesives and sealants. But it's working great several years after installation. Thanks to a covering of roofing, sealing tape. Something like this: http://www.amazon.ca/EternaBond-RSW-.../dp/B002RSIK4G