keeps tripping all 12v dc

[hyundia]

hi i have a national tradewind 7372 1999.
the other day i went to start the genny,and all the 12v power went off.
also if i try to lower the legs this also trips everything.does anyone have any idears of what i might need to do to correct the fault

[Norm4015]

The first thing I would do is check the battery voltage on both the house and chassis batteries. The voltage may be too low and putting a load on the batteries kills them.

["007"]

Welcome hyundia to irv2.
Here is a thread that may help about your RV voltage systems.
Not knowing the age of your batteries you may try to charge them with a good 12V battery charger and see if they can hold a charge and work from there.