I’m having a hard time envisioning this roll of chains
Flat steel 2 inches wide with solid rings every 4 inches to attach chain to. Make the chains about a foot long so what you roll up or put together is the flat steel and the chains come with. Make'em in 4 ft sections and a bit wider than the ramp. A guy should be able to heft one section or he can use a wheeler when putting them up or taking them down. Hammer drill some big bolts with D rings to the concrete ramp for attachment or make footings for anchors. Make the chain at least a half inch thick and you have something that will last for years and years. Spray with oil when storing and rust shouldn't be an issue. Just seems like it would make fishing the race early and late a bit more enjoyable.