[Tfrazier]

Coach won't start. Nothing, no slow crank, no clicking, no noise at all. Checked both batteries with my multi meter and they are at around 12.5v. 
I normally start it up and move it around on a weekly basis when we aren’t traveling but I’ve been out of town a lot for work and it’s been about 5 weeks since I last started it. 

The generator cranked right up and I’ve turned the battery merge on. Jumping from from truck isn’t working either. 

Any thoughts?

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After last post. Tried to start it free m the engine compartment. She cranked right up.

[johnkosir]

I would check voltage at the starter motor , try to put 12 volts right to the starter and see if it cranks, check to make sure it has ground, if the solenoid does not pull in it is probably the solenoid,

[cwl1979]

Mine does this as well. On mine the ignition is really worn out and takes a jiggle to get it to work. Its on my list of things to repair.

[HoosierDaddy]

What John said. Sometimes if you just tighten the nut that holds the large batt cable to the start motor that is enough. Whether that works or not it is good practice to remove that cable, wire brush the mating surfaces , apply some grease and reassemble.
You could rule out Carls idea by checking for voltage at the start solenoid primary (small) wire while an assistant turns the key to start position.
Hmmm I should have read your addendum!!

[encantotom]

on your starting batteries will be a T fuse that looks like this.   if this is blown,  you will not get anything to the starter.   ask me how i know

have a look and measure it.   

tom