VEVOR Electric Trailer Dolly, 5500 lbs Towing Capacity, 380W 12V Motorized Jockey Wheel with 23 ft/min Moving Speed, 12.2-24.8 in Adjustable Clamp Height & 8 in Rubber Tire, For Moving Caravan Boat

Hi I'm Steve , Is the battery already on the dolly in the box?How do charge battery?You don't plug anything into ac outlet ?Thanks for your help !

I’m looking to put this on my boat trailer is it removable for when I launch my boat

So do you use 2 12V batteries or 1 12V battery?

Is this waterproof?

I cannot get the final 2 bolts to attach the actual dolly to the curved section of the plate. It seems that the rounded opening is not round enough, or, the plate that flips over is not wide enough, or, the plate mounted to the trailer is too wide. Some tolerance is off. I could open up the holes in the round plate, or smaller hardware that doesn't use the welded threaded nuts, I suppose. I am aligning the raised ridge as intended. Has anyone else run into this problem?