[crang]

I recommend the plug in wiring. I didn't have this available for the 04 sienna, so I used an OEM version and spliced the wires. The brake booster and 12 volt accessrory wires run from the battery down the driver side of the van in a wire raceway beneath the doors. Quite easy to install. I keep the 7 wire plug in with the jack and remove teh cover when I use the trailer.

YES the 2" non-Toyota hitches do often scrape the ground, especially on sloped driveways. Annoying but never been too much of an issue.