Am in the middle of extending a H.F. trailer frame using a 2" x 1/4" wall box tube 10 ft long. Attaching to frame above the axle using 3/8" x 3" - grade 8 bolts, nuts. miscalculated the frame center but have drilled correct centers and started mounting.
Need to purchase longer bolts for two cross members as they have plywood overlay so 4" bolts required.Bolting the 2" box to 3 cross members and the original hitch connection area.
I discovered a major weak link in original frame as only the welds holding the 2" boxed section that sits above the frame are what connected the frame to the hitch. Correcting this weak link.
H.F. frame tear drop trailer builders, you need to strength the tongue area by adding a 2" box tubing. Somewhere on this site it describes this mod but couldn't locate said mod.