A pre-fab hitch will only fit (or come from another) FMJ vehicle (only). Nothing else out there will work/fit without modifications,
If you are going to make a trailer hitch yourself (which could be either by self or get someone (like a welder) to make one for you) – you do have a few options:
Option one is to bolt (please don’t weld it onto your existing frame – because if you do, you will find out, a month or so later, that you will need to remove something that is now inaccessible, like the fuel tank, for example) it to the lower side of frame rails.
You can bolt it onto either side of frame rails.
An option to above is to add reinforcement plate on other side of frame rail (to avoid crushing the frame rails when tightening bolts.
You can make a C-shaped section to the hitch that will cradle the frame rail (what I recommend).
Optional (but this will not be easy) is to find a way to get inside of the frame rails and weld tubes inside of it (where bolts are going through it) so frame rails wont crush when bolts are tightened. The easiest way to do this is to cut holes inside of trunk and re-weld closed afterwards.
This might be best if a person was changing out the trunk pan due to rust repairs.
The C-shaped section method would be by far the best (last picture) – but the most labor intensive to create.
Those frame rails are not that strong, and it doesn’t take much to crush one when tightening bolts.
BudW