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Rusty, After reading the manual for the Vanner and Cooper systems: both are designed for powering external 12V loads. I'd say that your Vanner rep was confused.

I have one of the 100A Cooper versions.

I get what you are saying about increased load, higher heat, etc. However, Vanner claims a load current rating in the 60-100A range. If you can't run even modest tens of amp loads without catastrophe, it sounds like a poorly engineered converter or wildly exaggerated capability.

Why do you believe this will shorten the life? This is what the manual states is normal/ intended operation? Functionally, the battery equalizer is like any other DC-DC converter with the difference that the output voltage is exactly half of the input. As long as you are not exceeding the...

Generally, you won't drag down your 12V battery below ~10% depth of discharge. The minor difference in DOD will self equalize during a normal charge.