Pickup truck tow vehicle stability tests

BenK wrote:
Common sense is very UN-common...

stand with both feet touching and have someone push you sideways

Again with feet wide apart

Which one will have that person pushing you sideways easier?

But...this is a common sense topic, so tough to get common sense into the
discussion...

The same common sense also applies to a low center of gravity and long wheelbase. Yet those often get argued with too. :R

I didn't have time to read all 7 pages, but I will say that with the same FW I don't take certain curves at the same speed with my now srw as I did before with my then drw. The first time I did one particular curve, while the speed was not dangerous, the feel was very different.
If I could have found the right used drw I would have preferred it.

I will say this from experience towing the same exact 5er with a stock 2005 Ram 2500, stock 2010 Ram 3500 cab chassis drw, stock 2013 Ram 3500 sew and the same 2005 Ram 2500 with modified suspension and will tell you that 99% of stability comes from the suspension and not the tires. If you are towing a trailer that a srw is rated to handle and you are in an accident that causes the truck to overturn chances are very great the a drw will go over also. The operators driving ability is going to come into play more than the extra tire sticking out of the rear of the truck.

BenK wrote:
Why my Suburban has -1.5" offset alloys....stock is +1.5", so the net for both
sides is an increase in track of 6"...plus that my rims are 10" with stock at 6.5"

Means another 3.5" wider track

Plus my tires are 10mm wider, so 10mm wider track

All adds up to about 10.5" wider than stock track, front and rear

A dually has an even wider track








It is not any one aspect, but all of them in concert that matters...AKA in context


If this guys car had a narrower track...think he could do this with the
exact same car?...or would he roll over?

This is part of what a dually does better than a single with a narrower
track...managing that 'push' and 'sway' from the trailer

leanbar sidewall aspectratio track

What you failed to mention Ben is that car is going through the curve twice as fast as either a pick up with or without dual wheels.

45Ricochet wrote:
I did find this testing that was done for the van transportation business. It's long but seems to prove the DRW will have less roll over rates.

LINK

Dual Rear Wheels (DRW) are available with either the 4x2 or 4x4 drive system. Dual
rear wheels help increase rear traction, towing stability and provide increased rear
axle weight ratings. The Front Suspension on F-250 4x2 models is an independent
Twin I-Beam design. The optional Heavy Service Suspension Package includes Heavy
service front springs, auxiliary rear springs (SRW) and steering damper. Super Duty F-
250 Pickups (and Pickup Box Delete models) feature a Ladder-type Frame with rear
kickup that is wider than the Super Duty Chassis Cab frame.

45Ricochet - That linked document is pretty interesting - when you read about the Big 3's resistance to stability/safety testing of passenger vans designed for 15 souls on board one isn't surprised there is not a lot of test data on pickup trucks...

45Ricochet wrote:
I did find this testing that was done for the van transportation business. It's long but seems to prove the DRW will have less roll over rates.

LINK

Dual Rear Wheels (DRW) are available with either the 4x2 or 4x4 drive system. Dual
rear wheels help increase rear traction, towing stability and provide increased rear
axle weight ratings. The Front Suspension on F-250 4x2 models is an independent
Twin I-Beam design. The optional Heavy Service Suspension Package includes Heavy
service front springs, auxiliary rear springs (SRW) and steering damper. Super Duty F-
250 Pickups (and Pickup Box Delete models) feature a Ladder-type Frame with rear
kickup that is wider than the Super Duty Chassis Cab frame.

I would and will agree when using these vans or pickups as models. BUT, if you make the vans the same width with a wide(r) single wheel, same overall width, suspension etc, I would hazard a strong guess that the results will and would be very similar in the handling department. This is what has been found on semi tractors and trailers.

Marty

45Ricochet wrote:
I did find this testing that was done for the van transportation business. It's long but seems to prove the DRW will have less roll over rates.

LINK

Dual Rear Wheels (DRW) are available with either the 4x2 or 4x4 drive system. Dual
rear wheels help increase rear traction, towing stability and provide increased rear
axle weight ratings. The Front Suspension on F-250 4x2 models is an independent
Twin I-Beam design. The optional Heavy Service Suspension Package includes Heavy
service front springs, auxiliary rear springs (SRW) and steering damper. Super Duty F-
250 Pickups (and Pickup Box Delete models) feature a Ladder-type Frame with rear
kickup that is wider than the Super Duty Chassis Cab frame.

Opps, there's that word..."stability" again....

I did find this testing that was done for the van transportation business. It's long but seems to prove the DRW will have less roll over rates.

LINK

Dual Rear Wheels (DRW) are available with either the 4x2 or 4x4 drive system. Dual
rear wheels help increase rear traction, towing stability and provide increased rear
axle weight ratings. The Front Suspension on F-250 4x2 models is an independent
Twin I-Beam design. The optional Heavy Service Suspension Package includes Heavy
service front springs, auxiliary rear springs (SRW) and steering damper. Super Duty F-
250 Pickups (and Pickup Box Delete models) feature a Ladder-type Frame with rear
kickup that is wider than the Super Duty Chassis Cab frame.

Me Again wrote:
How many park their duallies in their garage vs having to leave them out.

If I get a new truck it will be a SRW and any new trailer will be sized for the truck! If we spent 5 winters in a 29' trailer we sure the heck could do it in a 32-34 footer under 17.4K.

Chris

My truck and camper are parked indoors.

How many park their duallies in their garage vs having to leave them out.

If I get a new truck it will be a SRW and any new trailer will be sized for the truck! If we spent 5 winters in a 29' trailer we sure the heck could do it in a 32-34 footer under 17.4K.

Chris