What Z said...the HF ones are too short unless your deck is only 2' off the ground. I had a full size Ram. 9' black widow aluminum, arched bi-fold ramp. I think they were $200 for 2. Lasted me 4 years of abuse and looked brand new when I sold them.
I have a 3/4 ton Chevy...the ones I linked to are not folding but hold more weight. They were only $100 though.