http://www.gatorramps.com/

It's the best on the market, but not the cheapest. It can also be used as a work bench so that you aren't bending down to work on your bike. It will handle up to 1500 lbs, and is easy to install and use! I can't remember exactly how much it is, but I think it was around $500. A friend of mine had one and loved it.



There are some more at http://www.SuperSportbikeLinks.com under the maintenance section.

Me, used to use a 2X10 that I had put some non-skid bed liner on. It worked better if you take the tailgate off. Now I use a trailer with a ramp, much easier to load, but it takes longer to get everything going.