This is a quick way to make loads of cash with little work.

Go to Ewan in your PMC and complete the winching challenge up to level 3.

This is easy, all you have to do is stack a tool box up to a certain height.

Then, after level 3, change the wager till its maxed out then do level 3 again, once completed the max amount will increase each time you do it, the height never changes so just do the same thing again.

Soon you earn millions just by doing this.