Sounds like your wiring was a bit old and just that could have caused the fuse to blow along with the ground issues you mentioned.
Just for edification. You mentioned you thought they may have expected you to charge the battery from an external charger. I dont think it would be wise (and maybe in viloation) for a trailer mfg to not have provide hot feed to the battery as it is the emergency source as Bill mentioned for your brakes. If you camped all weekend and almost drained your battery, when you depart you wouldnt have emergency braking but you wouldnt know it. You need the wire to charge the battery. Then you never need to worry...it should be charged when you arrive at your campsite.
Glad to hear you got it fixed. Dont forget to remove the bypass around the breaker. 
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Bruce & Carolyn Wittmeier
2001 Ford F250 PSD, Ext cab, Shortbed, Island Blue/Silver, 4X4 Off-road, SOF Auto, Alum Wheels, DP-Tuner 40/80/120HP, Chrome Step, Line-X bedliner, Jordan Ultima 2020, AirLift 5000 Airbags, DiPricol gauges
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