I did finally get my answer from Progressive's website. Under a list of FAQs they suggested against upping the amperage of the converter as it could overload the wiring resulting in overheating. I'll follow their lead and stay with a 60 amp.
We have 2 6V GC batteries. All 3 TVs and video equipment run off the inverters. Drains the batteries quick if the converter isn't charging. I have it out of the MH now and plugged in nothing at the leads. All 3 fuses check good.
Thanks for everybody's help.