Mini Golf Cart

Any GOOD weld should should be able to add a rear hitch. Have it welded to the frame with a standard 2" receiver, they pull boats, jets skis & ATV's behind all the time around here. I saw one class A with a hydraulic lift on the rear and a Harley Dresser on board. Personally not sure I would trust one wheel. I have used one like this more than once to haul ATV's.   Trailer link

What ^^he^^ said.  In a lot of places, towing a trailer, or "doubles", is illegal.  Some people say they go through those states with no issues, but are you willing to run the risk?  Here in AZ, towing doubles =is= legal.  First hitch MUST be a FW, second hitch can be ball or pintle; NO doubling up with 2 ball/pintle hitches (though you see a lot of construction people doing so).  Max legal length is 65' from the front bumper of your truck to the center of the rearmost axle, BUT you are allowed 10' of "overhang" from the center of the rearmost axle, giving a 75' "ultimate" length without a permit.  (Mostly for boats with outboards or sterndrives.)  If the 2nd trailer is > 3k GVW, you MUST have brakes.

Now, on to swivel wheels.  In many states, a swivel wheel is considered a trailer, even if it's solidly mounted to the FW frame and, if double are illegal, then you =might= be cited...but you might not be.  From my reading the past 15 years, or so, some states have actually =codified= a swivel wheel as a trailer, even if it doesn't really meet the definition of a "trailer".  (Sorta like how cities like to call your Red Ryder BB gun a "firearm".)

If you do want to do this, then you have 3 options.  1) Small utility trailer sans brakes, but you will need lights.  Typically, you can easily have a 300 lb capacity hitch installed with few issues or mods needed.  Most newer rigs have the beef to support a 200-300 lb hitch designed in, even if it's not installed.  2) Swivel wheel "tote".  Will almost certainly need mods to create the 2 attachment points.  May, or may not, require lights, but =I'd= certainly install them.  3)  Cargo rack rated to carry the cart.  THIS would almost certainly require major mods, possibly including fishplating the frame all way up to the axles, depending on the weight you want to carry.  You'd have to talk to a fabricator to figure out what you'd need.

If your rig is under warranty, an mods you do are likely to void the frame warranty, at minimum.

Lyle