I periodically have the right rear wheel on my 2017 tandem axle make a squeaky, squealing noise. I notice it at the boat ramp after un strapping the boat and going slow to launch the boat. I’ve jacked the trailer up and had a buddy spin the wheel as I used a screwdriver to pump the actuator and everything works as it should. Could the caliper be occasionally sticking? I’ve also used a temp gun and checked the rotor when I get home and it seems fine. Wheel bearings are fine and no signs of grease leaking. This is a fairly new axle and Vault hubs. Thanks