Smaller truck is a lot of explained variables. A newer 1500/150 series could be able to handle it with proper gearing and engine. But if you are talking about the Ranger and Colorado sized trucks, I'm not so sure.
Unloaded vehicle weight of the 2150RB is listed at 5,295 pounds, and gross vehicle weight is 6,695 and tongue weight of 427 pounds according to their site (the 2020 model info). It all depends on the truck and configuration he is moving down to. Just saying a half ton can tow it still depends on how the half ton is configured (engine, transmission, rear axle ratio, body type, etc...)
Also it looks like the 2150RB is limited to existing dealer stock, so they apparently are not going to make any more. If he is set on that floorplan, he might want to not wait too long.
Just the 2 of us in a...
2015 Freedom Express 246RKS
2002 GMC Sierra 1500