On my 3170 Sunseeker class C motorhome. My 0nan 4000 generator is started from the house batteries, of which I have 2. My house batteries are charged by either plugging into electric service or my motorhome's alternator. The motorhome has its own starting battery. The only time my genny would not roll over was my house batteries were down due to overnighting in a parking lot. I idled the motorhome for a bit to charge the house batteries a bit and started the genny. The genny than charged the house batteries.
There is a switch somewhere in your motorhome that will disconnect the house batteries so they will not drain during storage. Is this switch switched on? It will be a round red knob probably close to the batteries, if not in the same compartment.
Check your batteries with a volt meter, if it reads 11.2 volts or less, batteries may be dead. If you are using 6 volt, one dead battery in the bank will bring the entire bank down. I would start troubleshooting with the house batteries and work my way from there.
You should be able to start the genny at the genny, you could have a bad starting switch in the coach.
Let us know what you find.
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Dorothy, Miss Bella and I. Sometimes daughter and grands, loving life.