I purchased one of these last April before the show season began.
Swift Hitch Trailer Hitch Aligner Portable Wireless Camera System with Night Vision 04928 : Trailer hitch bike rack and trailer hitches - etrailer.com
It is more expensive than the one you posted. The reviews I read were good.
I used it for the first time at the Gettysburg meet and it was GREAT.
The "night vision" infra red feature is a very NICE feature to have when hitching up in the dark.
Having used it this year I can honestly say it was worth every penny.
Good luck with your search.