FWIW, I sometimes use a pair of 10' scrap 2x12 as ramps for my trailer.
They do bend a lot, but I haven't managed to break them yet. Using the full
span, I wouldn't go more than 400 pounds or so (myself plus a major
appliance); but over shortened spans (perhaps 3 feet) I've moved a full size
(upright) player piano.
Randall
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