I have the newer style "Fast Guns" with a longer j-bolt. I still had to use two quick links, 3/8" size for more security. The "Fast Guns" go on easy, they only have to be snug, you do not want to force them on, this will cause problems with the eye bolts mounting area on your camper. Take your time and adjust all four to the same tension. Then mark your fast guns for their position on the camper i.e. l/f, r/f etc. Your camper for the most part will be reinstalled very close to the previous position after removing and putting them back on. I have yet have one come loose on the roughest of roads. Much more secure than the turn buckles. If you are looking for longer 3/8 j-bolts, "that's the size my fast guns take", Fastenol sells them. So far so good, makes for reinstalling camper very quick, or removing. Make sure you install the safety pins so they will not pop open !!