autozone here sells a keyless remote that controlls 4 separate circuits for under $50. this is the one i use on my bus
Part No.: PL-SW29
another option is to use the remote from a remote start unit. They are under $50 also and perhaps easier to find.
if it's already electric, a remote is 100 times cooler than pushing a button attached to the vehicle.
you can also wire in the runninglights to come on when you push the door open button just for a cool effect.