Are schawns trucks on alternative fuel?

Some of the C6500/C7500 Chevrolet/GMC trucks are LPG powered. The W series Chevrolet and GMC trucks, and the ones built on one ton cargo vans, are either gas or diesel powered.
Some of the C6500/C7500 Chevrolet/GMC trucks are LPG powered. The W series Chevrolet and GMC trucks, and the ones built on one ton cargo vans, are either gas or diesel powered.