I'd be more concerned for the trailer frame being up for the extra stress. A long time ago, there was a poster who was all proud of his home built swivel wheel "trailer" for carrying a golf cart... only to come back like 6 months later complaining that Sabre denied his frame failure. Impossible to say that one caused the other, but the coincidence is uncanny.
But, you're right - people seem to be doing it successfully. I have friends who are setup to flat tow their car with their Space Craft toy hauler; but it's a 45' rig on a custom semi-trailer chassis.
I think if I were to do it, I would do a couple of things:
- Have someone examine the frame and make reinforcements through the entire length of it
- Figure out brakes for the Jeep and how that works
- Figure out lighting for the Jeep
- Take it for a test tow and have someone follow with video recording to be examined later
- Regularly examine the frame and all attachment points while in use
Truthfully, I'd love to do something similar. I'd love a little runabout play car.