[Daryles]

It is normal for each tank to have its own regulator.
I have read that's RV code somewhere.
In the files section there is a copy of the Auto switching valve operating manual that is located above the left side tank.
Can't help you with the leak.
There was a recall on some fittings that leaked some time ago. I don't recall the details. A copy of that might be in the files section too.
Depending on your model some have experienced issues with the propane flex line going to the slide. I would inspect this hose closely.
As far as keeping track of propane levels, we have Mopeka propane tank sensors. They work perfectly.
I'm going to add them to all the other tanks too.