I have used Rotochocks with four different trailers and with different wheel spacings I now have three different sets of blocks that I can use if another trade happens. I have never had to re-tighten them after the first setting and always have to use force to get them apart when removing even after setting for a week or more. I always pull them to the furthest hole that I can for the pin when setting them the first time.
2011 HH DA 349 RSB 5th
2011 F350 Lariat 6.7L PSD CC SB 4X4
18K PullRite SuperGlide & 50 gal Titan fuel tank