Bolt locks by Strattec
http://www.boltlock.com
Locks for locking receiver to truck, trailer to receiver, trailer doors, etc. All these locks are being keyed by the truck key you use to tow the unit. I have a 2015 Chevy 1 ton so I ordered my locks for my vehicle key. So now I have one key that fits my vehicle and all my locks.
Tilt-A-Hitch Jacksboro, TN
http://www.tiltahitch.com
This trailer hitch will allow you to raise the front of your trailer up four inches higher and lower the back four inches making it easier to load and unload your Slingshot.