Update on the tiedown brackets. I bought a $5 piece of cutoff 1/4" hot rolled steel angle (3"x5" angle) and after introducing it to my cnc bedmill I now have four fairly beefy tiedown brackets. I ended up going with two 3/4" holes with a 1/2" breakout all around the holes. The edge with the holes will hang down below the camper about 1-3/4". I figured the 2nd hole might be usefull for a safety chain or even a hammock tie point :-)
edit: So I mean these will hook around the 2x1 base frame of the camper as suggested by Bedlam (thanks) and be fully welded on the sides and top.
