Well, I went to ram trucks, and downloaded the owners manual for 2015 2500/3500 trucks....and it is 883 pages long vice 296....so I am not sure what you are looking at and calling an owners manual.
And, in the Starting & Operating section of that manual, on page 664, right hand side of the page, it says:
Towing Requirements
To promote proper break-in of your new vehicle drivetrain
components the following guidelines are recommended:
CAUTION!
• Do not tow a trailer at all during the first 500 miles
(805 km) the new vehicle is driven. The engine, axle
or other parts could be damaged.
• Then, during the first 500 miles (805 km) that a
trailer is towed, do not drive over 50 mph (80 km/h)
and do not make starts at full throttle. This helps
the engine and other parts of the vehicle wear in at
the heavier loads.
Amazingly just like what I posted earlier.
BTW, it is nice to have it all on the computer too, if you want to download it.
It is free..................