Originally Posted by extiger
I now see your point, it is important to look at both the payload and towing capacity...
in fact many of us believe the 'towing capacity' figure is the MOST misleading number...
especially on smaller vehicles or those NOT really intended for towing.
and for folks TRYING to use a tv RIGHT AT it's rating limits or over them...
the IMPORTANT ratings/number are these...
1. gcvwr (this is the weight limit for EVERYTHING rolling, tv, trailer and ALL the stuff in/on both)
2. payload (basically the gvwr-curb weight+options)
3. axle/tire load ratings (front and rear)
4. the TRAILER carry capacity (since trailers with tiny payloads means carrying more stuff IN the tv)
"tow rating or towing capacity " is a simple consumer friendly offering and ADVERTISING tool...
but that HEADLINER/AD figure leaves OUT many of the IMPORTANT issues that lower those PEAK figures.
MANY of the tow ratings fail to account for the driver, passengers and FUEL or ANY options on the vehicle.
this is why for example VANS often have MORE real towing ability than suvs...
because vans (people haulers) often have higher PAYLOAD figures.
it's also why the 1/2 ton trucks are WIDELY different with payloads from just over 1000 lbs to >2000 lbs.
Originally Posted by RavenDog
I was surprised to see that even the F250's come standard with the 3.55.
I understand all the manufacturers are trying to increase mileage on all vehicles but 3.55's on F250's?...]
because the 250s with DIESEL have SO MUCH low end torque and a power band in the LOWER rpm zone...
a 3.5 on the diesel will NOT be a limiting issue towing ANY AIRSTREAM of ANY SIZE or YEAR.
the differences (mpg, 0-60, noise, and every thing else) are MINIMAL on drivetrains with >300 ft/lb of torque and the 250 is >500 ft/lbs.
the 4.10 is TOTALLY un necessary on any recent powerstroke UNLESS one is planning to haul (carry/tow) 12k or more.
for example towing a 4 slide 5th wheel OR carrying 2 motorbikes AND towing a 34slide 'stream (350 dualy or 450)
with SMALL v8s or v6s (gassers) or OLDER engines with LESS torque/hp, the 3.5 vs 3.7 vs 4.1 MATTERS for towing.