My new Curt Echo came last night via UPS. I had heard that European vehicles (my GLK included) can be finicky with the seven wire connector TV plug. I thought that the Echo with its Bluetooth connection might be the easiest way to go. It looks like it is very simple to set up so I expect as long as U haul gets the connector wired right I will have a plug and play situation with the brake controller. Now my chimpanzee brain is worrying how I can check the quality of the wiring at the U Haul store at delivery this Saturday. I would hope they have a dummy load tester they use to ensure their wiring installation is correct and use the same tool to demonstrate it to me. Anyone have any experience with a U Haul installation that included the wiring? Did they have a tester they used to show the wiring was functioning correctly? I want to go get the camper after hitch install on Saturday and need to make sure was done correctly.