Sagebrush wrote:
I wouldn't use square tube stock myself. 1 1/2" X 1 1/2" X 3/16' steel angle comes in 4' lengths. Welded together as a frame you could make it a tight fit or add some storage space. Some build a box with expanded metal sides and top. You can hinge a side for easy removal, make it all lockable with pad locks. The full box secures the generator too. You could then bolt that to the tongue via some custom clamps, no drilling needed. Or just weld it solid if its going to be permanent.
I really want to keep it light and simple. I'm not concerned about theft but will put a lock on it. I do plan to bolt the rack to the tongue without drilling the frame.