Simpler still (and portable) -
A suitably strong ramp for the back of the pick up and a two-wheeler with good tires (the air-filled ones are better than the solid kind, in my experience) and just roll the kegs up and down.
You can probably find a suitable handtruck at Home Depot or similar or if you want fancy, you can get one made for keg moving
And for a ramp -
Randy