M101 Lid Build
In response to a PM about the lid build, I am posting the info here in case someone else is curious.
The top rim of the M101 trailer is made from square 1"x1" tubing, so the square 1"x1" tubing I used for the lid frame sits level on it. The frame is made from two 1"x1"x6' (sides) and five 1"x1"x4' square tubing (crossribs) bought at Home Depot for about $120. Had to trim about 2" off the three middle 4' rib pieces before welding it all together. Clamped the pieces down on the trailer rim and tacked them together for welding.
The top material is cut from a 4'x8' sheet of cold rolled steel 16 gage. It was $65 plus $20 for the cutting to size at local metal yard.
Used 1"x3/16" rubber gasket (Ace) with adhesive on one side attached to the lid to seal out dust and water. While the lid's weight has really compressed the gasket, so far no dust inside from offroading, and no water leakage in downpour.
About $275 invested in the lid including hardware (hinges, struts and locks). It weighs about 85 pounds and the tent weighs another 125, so when towing offroad, I use the tiedowns as mentioned in post above to relieve stress on hinges. Otherwise, I don't bother with the tiedowns.
BX