I would either go with a drive over, build a cement drive over to use your current auger in, or buy a different auger with a low profile hopper.

If you can get set up to always dump at the same bin and then transfer corn I'd probably lean towards cement.   If you have to dump into multiple bins I'd either go with the drive over or a different auger.

We've got a 22' Jet with a side chute.    I try not to use the side chute much and most of the time I wish it wasn't there.

With dry corn the side chute will leave ~30 bu in the trailer.  With wet corn like we had in 2009  (30%+) it will leave ~130 bu in the trailer.