No way I'd trust a pair of cheap Harbor Freight plastic junk ramps from China.
Buy some quality metal ones. ...
Can’t find any for less than $300
Cut some from 4x4 or 4x6 pressure treated timbers.
I've driven my semi trucks on to timbers to change outside tires.
Cut an angle on them like an old fashion door stop and bolt them together. I've counter sunk and pinned a second level. You could even get fancy and add sides liked the commercial ramps.
Or you could buy angle iron flat ramps (like for a trailer) and attach them to a 6x6 or a rail road cross tie.
View attachment 351215
Or you could buy a 2x12 and do this...
View attachment 351218
But I would chamfer those edges, Titebond III glue the boards together, them drill down thru and drive dowels to pin it together instead of nailing...or you can counter sink big bolts.
Just some ideas.