Planepilot
Member
Thanks CJ7!PlanePilot, welcome to the club! It will all work out, just a little sleuthing required...
First, would need to better understand the symptoms - since I’ve never driven on a bowl of jello, what exactly does that mean? Are we talking
- “dart-y”, where it seems to exaggerate steering inputs, or
-“wiggle-y” where it repeatedly cycles/circles/loops around when driving straight, or
- “vibe-y” where there seems to be a low frequency high amplitude vibration, or
- “oval-y” like a tire is out of round, or
- “grease-y” like your driving on a slippery road, or
- “marshmallow-y” like the rear floats up and down
- “unsteady” where you constantly have to make opposite steering corrections, or
- “confused” like the front and rear (or truck and trailer) seem to have minds of their own?
Second, what are the weights of the truck axles with no trailer?
Third, what are your tire pressures cold and unhitched?
Forth, was the TT and Anderson purchased new? Who set up the WDH?
Fifth, when driving down the road, what motion do the safety chains display (like when you're looking at the backup cam zoomed in)?
Sixth, how do the truck and trailer sit when hitched? Are they both level to the ground?
My Laramie, unhitched, last scaled at 3220 steer / 2720 drive, 5940 total (did have some stuff in it). Yours probably a little heavier. But assuming they‘re close, you’ve rig adds 80# to the steering axle, 420# on drive, so 500# tongue for a 5340# TT. But I’m betting your truck‘s a little heavier, so less than 9% tongue. Not sure that’s the reason, but I’d double check the WDH rigging, and whether you need a drop hitch.
And your thoughts on the effect of low profile tires are probably going in the right direction...my stock 20s and stock Duelers work fine with a 6800# TT.
(oh, and what do you fly?)
When I referenced the jello I meant "wiggly". Where it repeatedly cycles/circles/loops around when driving straight. That is a good description. It is almost "unsteady" but, after settling in and driving, I know I do not have to correct. Just ride it out. It is not severe, just "wiggles".
2) Weight unhitched with me in the truck at 200# and full fuel (33 gallons) is 3440#'s on the steering axle, 2560 on the drive axle, 6000#'s total. No trailer.
My yellow sticker payload is 1376#'s.
3) My tire pressure cold, unhitched is 36 psi. I use a digital Milton tire gage/inflator. Double checked with a pocket gage. (I can't help myself! I have a Quality Control Gage R&R background!)
4) Both the Andersen Hitch and TT were purchased new. I bought the hitch directly from Andersen and set it up myself. The setup is straight forward. (BTW, I used a calibrated torque wrench!) I am sure there is some tweaking to be done, but it is close. My plan is to weigh again with the WDH set up and re-weigh with the WDH off to see the effect of the weight distribution. An Andersen WDH is not a standard WDH. I am sure it isn't as effective transferring weight to the front axle as spring bars but should be more than adequate for my application.
5) The motion of the safety chains...? Now that is something I didn't think of! I will report back!
6) I spent sometime on making sure the TT and truck were level. I went into the Ram menu and put the truck into the "tire jack mode" to keep the leveling system from fighting me. When I took it off the tire jack mode, the suspension system only made a minor adjustment. Using the Ram Suspension System is sketchy to me.
7) And, most importantly, I fly anything with a piston engine in it. My wife and I are both flight instructors. We have own a Grumman Tiger and an Aeronca Champ 7EC.