Drilled through with self tapping screws and butyl tape to seal holes. I will get the exact size when I can. I may do a different design which would make it easier to move the awning forward or aft but waiting for it to cool down in AZ before I hang out in the garage.
Nice thank you for the quick reply! I’m also thinking about extending the tongue 2 feet out due to a tongue box, any suggestions as how to go about that? I bought some 2x3 and 2x2 aluminum tubing...oh yeah any updates on your water tank?