How about something like this adapted to mount onto a trailer hitch and use posts that slip into one another to make it high enough to get over the trunk lift.
https://www.harborfreight.com/12-ton...nch-61522.html
You could weld/mount it to a modified hitch mount like this:
https://www.harborfreight.com/ball-m...nch+ball+hitch
with a mounting plate welded to it. I wouldn't want to pick up much weight with it.
Don't rely on any of this to make something without seeking professional help. I don't want to be responsible for any kind of accident.