Hey Tracs, my garage is nearly identical to yours except I have 2 - 18 x 72 triple pane windows, insulated the thickened edge and have 100amp in garage. Sized up for 7 or 8kw boiler. I went with the Leb8. For the most part I keep it at 10c but had it up to 20c for a week in Dec. while doing some...
This is a 14' swing I made out of 2" hss w/.100" wall. The post is 4" hss w/.25 wall, bolted to a 2 x 2 x 2 concrete pad. Made my own hinges with sealed roller bearings. It use's a Liftmaster la400 to open along with a 600lb mag lock to keep it closed. It swings fine without a wheel for support.
This is what I came up with for my gate. 14' swing made out of 2" square hss w/.100" wall. Welded some tabs on either end for the tension bars & then tied the chain link on.