This is what I use.
6-ft. Galvanized Steel Ramps
http://images.canadiantire.ca/media/images...50_CC_32111.jpg
note sure if this image thing will work, but anyway, not keen on hinged ramps, kiss rule.
true get as long as practical and tie them to bumper when unloading.
Used 2x10 (cheap) but stopped before I really hurt myself.
The F-L has nice folding aluminum ramp, but I'm scard to use them, looks to nice, easy to steal.
My 5 cent