To keep the towing thread alive too.
I used the think that over half the RVs on the road were weight #s mismatched to the TV -- I am now convinced that estimate is too low.
I had to get the sales rep to pull a 20 page towing table document by Ram's weight engineers. Nowin 2013 you have to take into account 3 trannies, 3 rear ends and 2 engines for the 3500 and then at least 4 cab options as well as 2wd vs 4wd vs short or long box or yes then there is srw vs drw.... I try to stay within the #s and unless you pin the sales guy down, absolutely demand to see the engineer's #s -- you have no idea if your truck is within the limits of your trailer.
I mean if we had not landed a man on the moon and a rover on mars, I could understand how this might be complex, but seems like we are smarter now and should be able to stamp the #s on the door post.