This past weekend I took my new to me toy hauler tent trailer on a little 1400 towing mile venture from Central California to Southern Utah (Kodachrome Basin S.P. (camp), Bryce N.P. and Grand Staircase-Escalante N.M.). I kept her to no more than 60mph (I'm not into towing at 80!). About three times on what I believe to be a very slight decent while in 7th gear about 2000rpm at 60 with cruise set, T/H mode on I heard a horrible rattle. Like I was dragging a string of aluminum cans. If I killed the CC or got on the gas the noise immediately stopped. It only did this on the way there, on I-15 north of Baker, CA and well south of UT State Route 20. I stopped the first time and looked under the the truck and nothing was hanging off, leaking, etc. No dash lights. Transmission was sub-200F. Didn't feel anything different.

My only guess is the waste gate was opened slightly to relieve any excess boost. Has anyone ever experienced this? It was a little disconcerting and made for a few miles of worry.

Other than that the truck did beautifully! Trailer weighs 4000 empty and was probably at 4750, if that. No toys on the deck this trip. I was dry the first time she did it outside of Baker, but I had 26 gallons of fresh water, empty gray and a little black water the two times in UT. Got a late start so I didn't hit a scale on the way out of town. Put probably 50-60 miles on her on washboard roads to a couple trailheads in 4x4.



Overnight stop at Clark County Shooting Center, North Las Vegas, NV.



Waiting to hit the road home at Kodachrome SP Road and Cottonwood Rd for a buddy to dump his tanks back in the park. (She's looking a little nose high here.)

 

I'm wondering if your front axles were trying to engage vacuum issue)