Thanks for the replies everyone.
That surprises me that that little truck can pull adequately. My friend's name actually is Wally (he should have bought an Airstream for sure with that name!
) and this is his first trailer. I tried to talk him into an older Airstream, but he wanted to go new. Anyway he surprised me one day with this SOB. I forget the brand name, but it's an aluminum framed trailer with the white box sides.
Anyway, I do know that his truck's tire pressure wasn't high enough. He was running about 31-32 psi. I checked out his tires and they say 44psi max. They didn't have any load ratings on there at all, no C or D, etc. I told him that to the best of my knowledge, they're essentially P-metric radials just like passenger car tires, although they have a more aggressive tread pattern and look like "truck" tires.
Anyway, he didn't have enough tire pressure. His hitch is a Reese and has the ear for the friction/oleo assembly. He may try to buy one of those to see if it works. It does sound like the dealership told him the truth about the Dual Cam from what you said above with the 400lb tongue weight, although if he's at 385 it'd be pretty easy to put something up front to add 15 lbs. The dealership didn't rule out the possibility of swapping him out to a dual cam.
So anyway, I told him to pump up the tires and either add the friction/oleo anti-sway shock or swap it for a dual cam. We should probably do the bathroom scale trick and get the real tongue weight. Although, I can deadlift 405lbs, so an easy test would be if I cannot lift the tongue, then it's dual cam ready
There is a CAT scale about 10 miles down the road from us, so we could maybe run down there at lunch time and get some real weights. I have the SAE paper that talks about having the CG 15% ahead of the axle(s) centerline and how that equates to about 10-15% of the trailer weight in tongue weight. We need to get real weights.
Of interest, he only got 12mpg towing. I got that pulling my 34 footer through the mountains of PA last month with a motorcycle in the bed. I have a Dodge diesel and could put Wally's truck in the back
I'll keep you guy's posted. Thanks for the advice.