My guess is (since you were on shore power) the converter supplied power to the brakes and the battery(s) on a continual basis and therefore did virtually no damage to anything except maybe the brake magnets. The brakes typically pull no more than 3 amps per brake which equates to 3 x 12 = 36 watts per side. That may not be enough heat to do any damage (imagine a 35 watt light bulb sitting inside each drum). The converter could easily supply the 6 amps needed. Possibly the magnets have been overheated. I would call Dexter Axle and ask the question. I'll bet it"s happened before.
Maybe no damage at all, but might be wise to inspect the brakes.
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Essie, Jerry and Lil' Bit the Mini Schnauzer-(now replaced by TWO Mini Schnauzers, Sassy and Schotzi)
2010 TM 3326 loaded for 3 day trip, 4955# GTW, 26 gal. water, 9.5 gal. LP, 530# Tongue Wt., 15" Dual Axle, TST Tire monitor, Hensley Cub Hitch
2004 Suburban 1500, 11,100# CGVW
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