I, too, own a 34' AS. You didn't state if the disconnected brakes were on the same axle. If they were on the same axle then you have reduced, even braking. Not a good situation but manageable. If, on the other hand, the disconnected brakes are on different axles you are causing undue stress on the axle & chassis because of differential braking. This can't be a good situation.
Bottom line is repair the broken wires and tow safely!
Old trucks and old trailers . . . a comfortable combination!
A-6E All Weather Attack Driver, BUFF
USN Aircraft Maintenance Officer, Ret.
'91 Suburban R-2500 w/BBC
'78 Honda GL-1000
'72 Triumph T-100R Daytona