Here is what I found in a quick Google search.
http://www.tandem-tow.com/Models.htm ![](http://www.tandem-tow.com/vsImages/Banners/Options.jpg)
It looks like you will have to unload it to park the RV. It will put a lot of load on the RV hitch while holding a 1,500 pound golf cart in front of the trailer axle, as much of the weight will be on the hitch ball, with only about 60% on the trailer tires. Having weight behind the tow dolly tires will help reduce hitch weight. However if you ever tow without the load on the platform, I would hope there would be adequate weight on the hitch. If less than say 100 pounds on the hitch, it can become unstable. Putting a spare tire or two on the hitch can produce positive hitch weight, and stabilize things. .
Good luck,
Fred.