6 foot is a long ramp. As a general rule you can figure it takes double the strength for each foot of length. So a 5'has to be twice as strong as a 4' and a 6' has to be twice as strong as a 5'. So, if you can cut off a foot or so that would help. But if not you could take a flat and bridge it. I would go at least 4" or more for 6'. Once you put a bridge under it the bridge will be doing most of the work, so make sure it's strong enough.
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