Picked up a set from Sportsmanguide.com and they work great. Ran about $230 and it was the best investment I've made. Hated lugging the trailer around when I brought the ATV into the shop for repairs or service. Now it's a snap with the ramps.
Have a Polaris Sportsman 500 and a Honda Foreman 500 that load very easy into my Nissan Titan.
Pick up a set...you'll be glad you did!