Moving it and moving it effectly is a different matter and you need
more that 3.73 gears to move a GCWR of around 12 ton effectively
through mountains even with a CTD. That is why they have made
different axle ratios for many many years. YOu can move a lot of
weight with eninge a old 6 cylinder in a dump truck if you have the
right gears. Your drive axles are the strongest reduction units in
your truck and when geared properly can exert a lot of force. All
things being equal you will get about 11 to 12% more pulling power in
every gear with 4.10's with no added engine or tranny strain like you
get from chipping it to gain same boost in towwing power. There is a
reason that 400 HP OTR rigs have 900 cu inch and bigger engines so
they do not have to be "chipped" and can last a very long time even at
max power. There are some out there though that equate a CTD, PS or
Dmax to a OTR engine but it is not and they will suffer when run at
OTR HP power levels for extended periods of time. This is not a Dodge,
Ford, GM thing but rather a common sense thing and it requires
regearing for a proper long term solution. It is lot different to tow
in rockies than it is in the flat lands and what may work in the flats
does not always work in mountains but some seem to forget that. How I
would configure a low altitude flat land tower vs one that is at high
altitude and in mountains is a completely different matter. Detriot
does not tell you this either because it might hurt sales image of top
end trucks.  If you elect to chip it to solve problem, save some money
for when stock tranny gives up the ghost on a long hard pull. It is
not a bad tranny but it will suffer for boosted torque on long hard
pulls and shorten its life. Many avid "chippers" do not even consider
this. Manuals are a little more tolerant of this.    
-----------------
TheSnoMan.com

Tom Lawrence probably has the best idea on what ya need to do here. IMO,
that trailer needs something more like the Navistar "pickup" just for the
weight that truck would bring. However, the Dodge is more than able to move
it.

please see http://inlinediesel.com/forum/topic.asp?TOPIC_ID=617 and give me
your feedback and advice.
thanks,