Sounds like you already have an idea that would work. Lock that sucker down. It's amazing how many generators will just vanish!
We are thinking of building a hauler for our future scooter. We want to do a dual "receiver hitch" on the front of the bus. We built the rear receiver so it can't be too much different (just twice the work!
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My biggest complaint about my Hitchhaul is that it "wobbles" unless the load is balanced. A dual receiver would fix that.