Was able to move the frame out so that I could install the dovetail. 30" dovetail with a 7degree drop makes the step about 3.5" lower than the frame. I think that will be enough to help out but not too much that I'll drag the rear.
I'm going to weld in a 1/8 diamond plate step on the behind the rear fender so that should provide some strength to that weld. I might make a small fishplate for the outside rail "just in case"
This weekend I'll flip it over and weld all the topside joints. I estimate the weight right now at about 600lbs