Today while at the dealer getting my oil changed, I looked at the 2013's on the lot. They looked very nice

, much better then my 07, just waiting to pull the plug on a new one.
Wanted to see if I could tell how they increased the RA capacity by 200 lbs... They increased the rear tire pressure to 75 psi from 70 in the prior years. Why they didn't go to a full 80 and give a full 6390 that the tires are rated for except to give it to the 3500 srw trucks. Also the rear spring they are going with a 3 leaf main pack instead of a 4 leaf pack on the 2012 and earlier models. Also it looked like the overload lower leaf is a bit thicker on the 2013 but didn't have a way to measure.
Who has any experience with the Capless fueling system? The 13 has no filler cap for the diesel, just a spring loaded flap inside the fill tube. I see contamination issues. The fuel door on the body has a thin seal that is supposed to seal dirt and water from getting into the capless system. Any one who works/drives in dusty conditions will understand how dust seems to find its way inside. Also I can see water getting in, especially if using a pressure washer to wash and blowing water into the filler area. IMHO, I imagine the seal on the door will have to be watched and replaced when it starts to leak.
If and when I get one the first thing I will do is get some kind of a cap to cover the fill tube opening so water and dirt don't get inside the fill tube and on the flapper. Otherwise I think:shrugs the capless system is just asking for dirt/moisture getting into the fuel