I have seen a tool that applies pressure to the Sliding Axle Release Pin Lever so that a driver may slide the tandem axles on a trailer buy without others help in difficult situations. It had a spring within the tool (to apply pressure to the pulling lever) and a magnet at one end to hold it to the trailer frame... Can't find one at truck stops or tool supply outlets. Any Help? Thanks,. Gil

I think found out what it's called, but not the actual tool for sale.

Trailer tandem release leverage bar - - US Patent 6375162

This might help too:

New Product New 2 Piece Tandem Pin Puller And 5th Wheel Release by M & G MFG CO LLC