I received and installed the kit today.
The kit itself goes together very easily on the wagons, at least, just plug n play (the connections are already in place on the taillight assemblies, and there is a "T" connector that goes in front of the bulb failure warning module). The provided pigtail, as expected, is not US trailer friendly, as it has separate turn and brake light lines. I'm sure the $55 adapter has the converter built in...but I chose instead to cut off the included connector and rewire using a standard RV 7-wire connector. Since the US standard has turn and stop lights combined, I also had to put a generic converter inline between the harness and the connector. A few butt splices and some trailer debugging later and all works, including the backup lights which would not have been available had I used the Volvo 7-4 adapter. I can also use a cheap generic RV to 4-pin adapter ($10) when I want to pull a trailer that only has the flat 4-pin connection.
Since my RV style connector would not fit in the mounting hole in the factory hitch, I left the pigtail in the spare tire well, and will drape it out the hatch when I need it. This is how I've done it with our previous wagon and it works fine, plus the connector is not exposed to the elements year-round.
Overall I'm satisfied, though I think the price for the harness is a bit excessive, I can see where the costs come in as it's clearly a handmade part...
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