camper trailer bushes

Iv sent them an email and as this is my first camper, to remove the pins do I jack the actual trailer up not the leafs? then undo the nut and the leafs will come away from the frame?

Generally right, but if I was you I'd take it to a mechanic or suspension shop and let them do it.

Yeah matw did all bushes and wheel bearings myself over the weekend, now I gotta figure out the go with the dual batteries, apparently there wired up wrong, positive to negative, then positive and negative running up the front to anderson plug.

I'm thinking the batteries are not "wired up wrong" at all..

The 'in series' connection that you have described suggests to me that the batteries are in fact 6Volt (x2), connected in series to supply 12Volts (nominal).. A not uncommon practice, I believe...

:)