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Another option to keep the ramps from walking is to drill a hole in the floor big enough to put in a small dia pc. of water pipe. buy a long grade 8 bolt that will fit comfortably in the pipe, drill a hole in a 12" pc of 2" x 4" that the bolt can slip through.
Slip the bolt through the 2 x 4, then into the pipe. Needs a couple of inches into the floor. Now snug your ramp end up against the 2 x 4 and drive up. When you want to pull it all apart, just slip up the bolt and 2 x 4 and find a pc. of plastic rod that will fill your pipe. You can drill a hole in the plastic, stick in a big nail and use a magnet to pull it up out of the hole. Or leave the block and bolt in place to use as wheel chocks when you drive in rampless.
My ramp is similar in theory but 18" high. I have long ramps into the garage and they get removed once the car is up. I have similar spans at the middle that can be removed. I'm not into the form as much so it looks pretty crude but it's been used constantly for the past 2.5 years. I used a local hardwood to ensure strength.
We have had our SUV up on it several times too.
Dean's and Dwight's are pcs. of art. Very impressive and glad you guys shared.
Ken
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