How does the Ram REV system work?

Range Extended Vehicle might be the abbreviation for the 2024 Ram 1500.    

This speculation is based on the fact that Stellantis just submitted a trademark application to the USPTO for this word (USPTO).

Compared to REPB, it's a little simpler to pronounce and recall.

The Ram 1500 REV can come with a gasoline engine with a reduced displacement that serves as a generator to recharge 

the batteries. It may function in a manner akin to way the Chevy Volt formerly did.

This would imply that the engine would not at all drive the wheels. Because when charge is low, it will turn on to power the batteries.

It could also activate when hauling or off-roading. In subzero temperatures, then that could assist with truck operation.