RV can’t make it into driveway. Bottoms out hard.

Boards alone are not enough - what are the axle weights - ~4K lbs? Unsupported, boards are just going to bend or break for the span it looks like you'll need. Play around with a "draw" program to visualize the angles and clearances and get a feel for what span you'll need.

A couple of 2x12's set on sandbags to provide support and fill the gap to the street. Or, if you want a bit lighter/easier to handle, cut some triangle shaped pieces to fill the gap and glue/screw it together.