You can wire one up yourself without putting it there. I've seen it done a million times in the motorcycle world.
1) Buy an extra garage opener that will work with your garage opener. Program it to your opener (so it is learned to it)
2) Take apart the opener, replace button with a button from radioshack. Drill the button into the kick panel below the steering wheel. If you want to go trick, hide the opener under the hood, and run a harness into the cab for your button, so the antenna isn't' behind the firewall.
3) wire battery to a 12V Ignitioned source (you will need an appropriate resistor to drop it to the same V as the battery). Be sure it is behind the ignition so, people can't open your garage without the truck running.
Homelink, much easier.