i think clearly you need more than the Ah that you have today...in order to increase your dry camping run-time.
sounds like you have 2 problems: too small an inverter (can't sustain the start up) and not enough runtime / amps hours.
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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