Best Seller | MTI Industries SA-6200 Safe T Alert Trailer Dock The Safe-T-Alert Trailer Dock works on concrete asphalt sand rock dirt grass even muddy locations. The Trailer Dock will replace those worn out 2 x 4 s and will not leave dents in the driveway. Lightweight so you can bring it along anywhere and it even... more | | $36.99 $29.53 go to store |