Adding air bags isn't going to help your squirrely steering. Adding rear spring rate simply increases the ride height of the rear suspension. It doesn't transfer any meaningful load to the front axle.Have played with both my boat trailer (2500lbs) and 12.5ft utility trailer during my recent move. The 4Runner seems more sensitive to tongue weight than any previous vehicle I've towed with. Properly loaded it goes fine in S4 (D is worthless except downhill). But load it anything more than my guess of 400lbs on the tongue and it likes to stick the front end up in the air. I'm definitely going to be looking into some air bags for in the springs to help fix this. I don't care for squirrelly steering when I've got more than 15ft of trailer wobbling around behind me. Anyone have suggestions?
Adding air bags isn't going to help your squirrely steering. Adding rear spring rate simply increases the ride height of the rear suspension. It doesn't transfer any meaningful load to the front axle.
You need to either reduce tongue weight or add a weight distributing hitch to fix correct for inadequate front axle load.
I would add the airbags and the weight distro hitch. If you keep the rake of the rig level or close to level it will help more than not. The weight distro hitch is specific for stopping the trailer from "wagging"
Towing 8 hours to VIR.
Did very well and got 16mpg planning for hills.
Steady 75mph the whole way no issues.
![]()
Nice trailer. :thumb: and of course the e36 M3 and Mcoupe. What does the aluminum trailer weight, if you don't mind me asking?
You can't increase the limit. Factors:Looks like there is still hope for me. I'm considering towing track cars to HPDE, but seems like I'd be at or slightly above the towing capacity limit.
Load would consist of:
3200 lb car
100 lbs of tools/spares
300 lbs of humans
2000 lb UHAUL trailor and towing devices
Does anyone know what is actually limiting the truck to 5,000 lb capacity? Is it the strength of the motor, transmission, frame, tire load etc?
Just trying to figure out what is needed to increase the towing capacity of the truck so I can tow safely. The last thing I want is to lose control of a truck carrying my family and race car along with the truck.
I've never owned a truck before and am reading about weight distributing hitches, airbags, brake controllers, transmission coolers etc.
I'd be towing 200 miles each way with some portions of that being uphill/downhill freeway sections and hilly San Francisco.
How much money should I set aside to get the truck set up properly for this? And do any of you using the 4Runner as a tow rig still have the capability to do light off-roading without swapping parts out from the tow setup?
Thanks,
Ken
Reading this thread makes me feel a little bit better about what I'm about to do.... looking at possibly buying a used trailer this evening. Dry weight on it is 2900#. Seeing what some of you guys have managed to tow gives me hope that I won't kill my Runner!
About 4200lbs dry weight... Don't want to think about the real weight when loaded. Have taken it on two trips thus far, one being through mountain passes, highway and snow. Glad to say it did very well. Airbags, weight distribution hitch, heavier duty springs, keep me with minimal sag. I'm pretty much at, or slightly above, the stock tow limit, and surprisingly tows better than I thought. Just because you can, doesn't mean you should, I get it. But I'm still plenty safe and in control on the road. It's definitely felt on the bumps and curves.
![]()
![]()
![]()