We are replacing our pool liner and want to put in a vinyl over step - wedding cake corner steps. The PB has offered 3 options, a Latham thermoplastic with fiberglass rod system, a Cardinal steel with fiberglass rod system and a Cardinal steel with receiver. There is approx. $1,000 price difference between the first option and the last and the PB is a bit sketchy on what the functional differences are and what the best option is. Is the receiver system that much better or is the rod system adequate. Steel vs. thermoplastic ?? If someone has some familiarity with these different steps and could advise we would certainly appreciate it. Thanks very much.