www.clevertrailer.com
Not cheap but very well put together.
U-Haul's installation on my 2000 Dodge Caravan cost me my spare tire & my brakes. Luckily I was driving. Learned the emergency brake trick while holding the release to avoid showing cops my brake lights when I was a kid. Oh, u-Haul did pay to replace and fix everything.
I am working with the owner to see if smartcenterwarwick.com will install them. But if I did the conversion from Swiss francs correctly the full unit costs $675 including shipping to USA.