Broo

Guysand gals,

Have seen LOTS of different viewpoints on this from all over the web. Still (or maybe more) confused than when I started.

2018 SCREW with max Tow pkg, 3.5 liter with 3.55 rear end, Hankook 275/55R20 rubber. Door says recommended tire pressure at 35 psi cold. Pulling a 7000 lb travel trailer with a weight distibution hitch installed by RV dealer. Truck hauls it with ease but seems to bounce the rears a bit till pressures go up with the heat (typically around 42 when warmed up). Should I be upping the pressures slightly to START? I've been considering a 5-7 lb increase when hauling the trailer and reverting back to recommended pressures when "un-hitched". Notice that these are P rated tires and not LTs.

Thoughts from those who haul TTs?

MikeD134

I fill mine to 42 PSI cold @70 degrees when I know the temps will push 90s that day. My dash display will show them up around 47 48psi when they get warmed up in the afternoon which is fine. Like you I drop them back down to 35 when not towing.

OldElectric

I set mine to 2psi below max cold. 2psi below to account for gauge error.

heat is the killer of tires, max tire pressure is the 1st order defense against heat.

StonedFX4

I run 43/42 psi on mine year round. I found this psi is good for towing our TT as well as daily driving. Had the same "pogo" effect when running the recommended 35 psi in the 20's.

Nicklaus

The tire label in the door indicate the cold pressure for that specific vehicle. This is directly related to GVWR (max vehicle weight full loaded).

So if you tow/haul within the specs, the tire pressure on the label is the one to follow. The cold pressure implies that it is expected the pressure will rise while riding. Do not adjust.

Lower pressure than shown on label with vehicle load lower than GVWR may be ok if you know the load on each tire and refer the pressure/load chart to that specific tire.

Lower pressure than shown on label at GVWR leads to tire failure / safety issues.

Higher pressure than shown on label at GVWR, but lower or at max tire pressure shown on tirewall, may lead to drivability issues such comfort, traction, bouncing around, but tire structural is not compromised.

Higher pressure than max tire pressure on tirewall leads to tire failure / safety issues, regardless the load.

marshallr

The number on the door is for best ride unloaded. What is stamped on the tire for max load? It was 44 PSI on the P series tires I had before going up to E rated tires. I tended to keep closer to 40 PSI in them all of the time. I found it a lot easier to just keep that much air in them than do the "air in, air out" dance every time I needed to haul/tow something. I got 1-2 mpg better fuel mileage too.

Broo

Max tire pressure shown on sidewalls is 51 psi.

MikeD134

No different here lots of arm chair quart backs, heck even the pros that engineer the vehicles get it wrong (Ford's Explorer problem years ago with Firestone tires)

Just have to air them up in steps never going past the PSI stated on the sidewall, to see what tows best

Broo

Thanks for the input folks. Appreciate it.

Meathead

iTrader: (2)

I would probably put 45psi with a trailer with your particular tires.