[leegreen]

I had one of those universal fit hitches off a '99 GMC, I could have bolted it onto the '64 frame under my '52 by drilling a new hole on each side to make it a tad narrower, - width adjustment was no problem.
But height adjustment was non-existent and it would have sat way too low. Cutting the side plates down would only partially solve that and would result in only having 2 of the 4 bolts that held those plates together on each side.

I cut up and re-worked the ends to fit, I'll probably never tow more than a small utility trailer or maybe a 2000lb boat but my main goal for putting the hitch on was to protect the gas tank under the back of the bed.

You might get into difficulties towing if you have a home brew hitch and get pulled over? In RV season here it is not uncommon for them to target any rig that looks sketchy, like too small for the trailer. A visibly old vehicle towing a heavy load might also catch attention.