rib8s,
Well, I don't play golf, so I don't need 60 inches wide, but I do mount a UWS aluminum carrier to our rear hitch, and then mount a "made to fit" UWS tool box in/on the carrier. It's tight - never had a leak.
Here's the
link of the tool chest. You can see the carrier in the images. I got mine from etrailer.com.
I also added tail lights to the carrier as well as a backup camera. JIC.
Cheers.