We needed ramps for the trailer i built a while back but given the requirement for them to need to be 10 feet long
I didn't want to build a pair that would require Martin Licis to lift and move them.
It would be a bit uncomfortable but I can carry both of them at the same time
For the test they were placed on 8x8 blocks with 4x4's as safety blocks in the event they would not have been strong enough for the weight of the pickup. First the 4x4 was placed in the center allowing only about 1/2" deflection then moved further to allow 1 1/2 to 2" deflection
With the weight of the front of the 2021 F250 super duty parked in the center there is 1 inch of deflection