Brake issue

[Pocketlake1]

We have a 2015 High Country. Returning home all of sudden when hitting brakes they seemed to bucking, for lack of better term, even very low speed. No screeching. Disconnected rig and drove truck And the truck is fine. We’ve made several cross country trips over the years, had the bearings repacked and brakes adjusted a couple years ago. Any guesses on what the issue could be? Simply may need pad replacement? Camping World can’t get us in to look at it for a couple of months and wish I had better options for that. Any insight appreciated
Thanks Ken