I found some curb ramps listed in the new Gempler's catelog which might be helpful in starting your FGT on a lift. The black ones are made of recycled material, and, while the views on the URL don't show a side shot, they are circular at the thick (curb) end and taper to the flat. The yellow one is metal.
http://www.gemplers.com/product/160006/Curb-Ramps-Quad-wide
http://www.gemplers.com/product/160004/Curb-Ramps-Double-wide
http://www.gemplers.com/product/99311/Curb-Ramp
http://www.gemplers.com/product/160006/Curb-Ramps-Quad-wide
http://www.gemplers.com/product/160004/Curb-Ramps-Double-wide
http://www.gemplers.com/product/99311/Curb-Ramp