Have just bought a 1995 Ranger with Ranger Trailer. No owners manual however. The trailer has a cap that twists to engage or disengage the brakes. When I try to back uphill, this always moves and locks the trailer down. My driveway is on a hill and this causes me to have to leave my vehicle in the street while i get out to twist the cap again. One of these days my Blazer is gonna get smashed before i can do this. Am not mechanically inclined but there has got to be an easy solution to this. Any help would be appreciated.