Hey there Don, that's a good question as there's a lot of different tow bars available, and the answer is no, you are not limited to only a Blue Ox tow bar for your 2010 Scion xD using Blue Ox Base Plates # BX3778.
That said, it is easier and I do recommend going with Blue Ox as your first choice because you won't have to use any adapters; so if it were me I would go with the Blue Ox Alpha 2 # BX7380. But if you're okay with using adapters there are tow bars that come with them, the Roadmaster... view full answer...
The Curt T-Connector Vehicle Wiring Harness # C56136 is a custom fit harness for the 2009 Scion xD which has incandescent tail lights. If you have the optional LED tail lights there is not a plug and play kit but you will instead need to tap into the tail light wiring with the Curt Powered Tail Light Converter # C59236 which will also require a power wire ran to the battery. view full answer...