I got them from discount ramps.com ....Supposedly they are rated for 5k, but I never tried using them as is. If you can see in the photos, I had some kick stands welded on (they just swing down when the ramps open up). Also, after about 6 months, a crack started appearing at the hinge point, and I had my welder touch it up and add some extra welds to make it more rugged. Cheap Chinese stuff, but they work great. If I bought a new set, I'd just have my guy reinforce them before I even installed.I'm working on a similar setup, do you have a link to the ramps that you bought? My current ramps are a solid 10' ramp that won't work well for hinging.