An uninformed observation - wouldn't it make more sense to located the
engine over the axle or a bit forward and have the torque tube extend over
the trailer tongue area, thus the whole thing would be more stable and less
likely to topple went moved around (eliminate the negative tongue weight)?
looking again at the trailer i suppose the same goal could be achieved by
simply rotating the welded structure 180 degrees on the trailer.  some
outrigger legs could make the assembly far more stable than the current 3
point stance.    kevin

I intended to move it forward on the trailer rails Kevin.
Also when you are running it up the trailer hitch should
be attached to a pickup truck to act as an anchor. Either that
or install a trailer hitch ball on a post embedded in concrete.