I'm not understanding how a wheel basically running backwards on a reversed axle would drag, cause heat and damage. Our trailers do not have self adjusters so the brakes aren't going to tighten when the brakes are applied. Except for having primary and secondary brake shoes, I don't think our wheels care which way they turn.
When towing did you ever stop and check for heat on your wheel hubs? Were they blistering hot? They should be smoking. I'm not sure how inner seals blow out from heat. There is no place for the inner seal to go. Yes, grease can get past the inner seal but then the grease would wind up on the brake shoe and the pads wouldn't have any braking ability. I've seen grease get past an inner seal from pumping in too much grease.
I suspect you've been told some things that aren't entirely true. Something I'm missing here?