We have a 2016 34RL Cedar Creek with the residential refrigerator and ice maker. We never used the ice maker we have bought ice or brought from home. We Purchased the trailer new in 2015 and the trailer has spent one winter in storage, (-20F). When I winterized the camper last year I just blow out the lines to the shut off valve and used the pink stuff in the lines. I have never open the refrigerator shut off valve, just left it closed. This year I have never opened the ice maker water line and never will, everything works fine, we just buy or bring ice from home.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67