looks great and looks like it all fits well.So installed the second battery, went with the "under seat" location so I don't loose any additional storage as I lost a cupboard to the washing machine. Install was straight forward, used some washes and screws to hold down the battery box then sat the battery in. probably need to clean up the wires a little as the connections now are quite short between the batteries as I made sure the + & - of the connections were on opposite batteries, used 2 B&S cable between them it is bloody thick stuff, connected it all up and hopefully should now have double the capacity for the trip.
Will test out the ball weight once my adaptor for the tow ball scale arrives to see how much it has added.
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Can I ask what model number of Bosch battery you used and how much you paid?