I added the Air Dog when my lift pump went out. I removed the stock filter assembly. Have to say the stock filter is easier to change IMO.
http://i1343.photobucket.com/albums/o790/Dtropnevad/2004%20Ram%202500%20Cummins/2524233510034694626cfxyZL_fs_zps856ef834.jpg height=500 width=500
I put the same setup on my truck too. Now I don't need to change the stock filter because it's dirty. I'm told that the stock filter will degrade in time an just collapse and need changed anyway, but that seems to take a lot of miles. I haven't changed the stocker since I put the filter/water separator kit on 25,000 miles ago.
I think you first must ask how long are you going to keep the truck and how are you going to use it?
In my opinion, if you aren't going to be traveling very far, say +300 miles 3-5 times a year or you are full timing, diesels don't make much sense. Likewise, if your camping is not the main reason you are buying this truck and you'll trade it every 4+ years, I'd say diesels don't pay.
Don't get me wrong, I love my diesel, but even with hauling 10-15k miles a year, I'm not too certain todays diesels pay.
What weights do you have? You need to know the tongue weight, the GVWR of the trailer. If the chevy was doing OK with your TT, I'd guess that the Ram will do fantastic too, but it's best to check your weights to be sure.
That Ram truck is NICE. I drive a 3500 dually diesel and love my truck. How much? Ask my wife, I normally trade every two years, but I'm not even looking after 3 1/2 years. I just may have found a keeper!
We're looking at large 5ers and these things are HEAVY. I know a 1 ton dually diesel will get them moving down the road and that's not what I'm worried about. I'm worried about getting the rig stopped if something bad happens and the trailer brakes don't work, especially on downhill grades.
I wish I could afford a Class 8 Volvo tractor conversion, but I just can't right now, so I'm starting to lean towards a used Medium Duty Truck such as a Chevy C4500 or C5500 series that's been set up for 5ers. (Class 8 used in good condition and ready to roll as a RV 5er hauler = $80k, Class 5/6 used = $35-45k from what I'm finding).
Is Medium Duty overkill or a good idea?
Also, any other suggestions on MDTs and which Diesel engine will last the longest in this category? I've been reading about different Diesel engines and some seem to be more problematic (Powerstroke) and some seem to be unstoppable workhorses (like the Isuzu/Duramax 7.8 or the International DT466).
Before I could give a sensible answer, just how heavy is the 5ver you are looking at? This past winter we were looking at a toy hauler version, very nicely equipped, but it EXCEEDED my 1 ton dually by about 3k pounds. In all reality, I'm certain the truck would have been up for it if I was just running around the flat grounds of Illinois, but we a about half timers and live in ours half the year while hauling from coast to coast - it just would not work.
We still have our TT and I still own my 1 ton dually because we can't make the MDT transition and I won't give up my travels or travel in a RV without the luxury we enjoy. Our existing TT actually offers us that where a lighter, but more basic 5ver would not.