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does the boat really slide across those things well? I will definitely make me some if they really work for the same reasons. Plus, it's just a bear to shove it off back into the water without beach wheels in the surf.
The boat slides a lot easier on PVC than it does on rocks or sand. If you plan to beach your 21SC where you don't have cat trax they are your best option. They would work well on lighter boats as well, but aren't as essential.
Since the rollers are 15' long and the boat isn't... there are some tricks you should know. When beaching the boat position the rollers such that they start just above the water line and extend up the beach. Pull the boat in bows first, lifting the bows to hold the boat in wheelie position. Wheelie the bows onto the rollers and pull the boat up. After a few feet you may not need to lift the bows at all while pulling. It may help to lift the sterns if the bows are on but the sterns are dragging. Once the boat is about 10' up the beach you will need to lift the bows again. Continue lifting and pulling until the daggerboard trunks pass the last roller. Move around to the back, lift the sterns and pull out the rollers. Move around to the front, lift the bows and position the rollers as far back as you can get them. Move around to the back, lift the sterns and push the boat. When the bows start dragging on the beach stop pushing from the back, run around to the front and start lifting and pushing until the daggerboard trunks pass the last roller. Repeat as needed.
-If you have 4 people, have two of them stand on either side of the boat to control sideslip. Also have them push.
-Go straight up or straight down slopes. It is difficult to control sideslip.
-Don't leave a boat parked on the rollers if heavy weather is possible.