GD.. Because it basically doubles the tongue weight rating of the receiver on the truck. What's wrong with that?
A new Ranger is not going to have very stiff rear suspension and probably only a 500/1000 tongue rated receiver.
But, I agree.. Additional 'sway control' on the hitch is not always needed.. I don't have any of that.. Just an old EAZ-Lift #1000 bar and chain setup. Been using it for over 18 years on 2 different trucks (both F150's) and 2 trailers.. #5000 GVWR one and the current #7000 GVWR one.
I also figure, if you have to ask, you probably don't have all that much experience towing (not "you" GD.. the OP or other newbs at this RV thing).
I too have been towing various stuff for over 40 years. :)
But, it's the interwebs.. So anyone can say anything they want! ha, ha!
Mitch