Hi,
Duty cycle for a 130 amp is about 50%. So in real terms you have 65 amps to play with. The chassis may consume 1/2 of that so in real terms you have about 30 amps available.
One way to tell is to monitor the voltage of the chassis battery. If it falls to 12.9 it may be time to lighten the load. If it falls to 12.3 definitely reduce the load. Over heating may destroy the diode in the alternator.
I did install manual switching to allow me to disconnect my house bank relay from the chassis.
I have toyed with the idea of adding an external rectifier on my out of warranty 130 amp Ford Alternator.
On at least some of the Ford v-10's it is possible to add a 2nd alternator. That would be wonderful.