Sorry to hear you're having issues tracking it down.
I can't really think what would cause it to happen only when loaded.
Obviously, its something to do with the extra weight... which could be suspension components... but which?
Could also be a tuning issue - spark plugs, injectors, etc... which is more noticeable under the increased power required to accelerate extra weight...
Does it only happen under acceleration, or only when at constant cruising speed, or just at a particular speed?
Possibly could also be a drive train related issue... again only noticeable when moving a load...but I'd guess if it was drive train related it would be most noticeable under acceleration...
Sorry, I'm not a mechanic, but going on my gut feeling.
Probably cheaper to take it anywhere but a dealer, unless its under warranty.
It could be worth paying the relatively small fee to take it to a suspension place for a test... they offer some limited testing for a flat rate...in Aus we have a company called Pedders that offer a suspension test for around $30 AU (Guessing $20+ USD) to test x amount of suspension components on their computerised system.
Never done it, but could be worth it if you've got someone nearby with similar offers...
Obviously, at the price, I'd take anything they reported with a grain of salt, as they no doubt make their real money from finding something to repair.... but if something stands out it could be a cheaper option.
Failing that, taking it to a dealer, and giving them a brief write up of the issue, when it happens, at what speed/s, etc and what you've tried already, and paying just for a diagnosis, if at first, probably won't be as expensive...
Let us know how you go.
I can't really think what would cause it to happen only when loaded.
Obviously, its something to do with the extra weight... which could be suspension components... but which?
Could also be a tuning issue - spark plugs, injectors, etc... which is more noticeable under the increased power required to accelerate extra weight...
Does it only happen under acceleration, or only when at constant cruising speed, or just at a particular speed?
Possibly could also be a drive train related issue... again only noticeable when moving a load...but I'd guess if it was drive train related it would be most noticeable under acceleration...
Sorry, I'm not a mechanic, but going on my gut feeling.
Probably cheaper to take it anywhere but a dealer, unless its under warranty.
It could be worth paying the relatively small fee to take it to a suspension place for a test... they offer some limited testing for a flat rate...in Aus we have a company called Pedders that offer a suspension test for around $30 AU (Guessing $20+ USD) to test x amount of suspension components on their computerised system.
Never done it, but could be worth it if you've got someone nearby with similar offers...
Obviously, at the price, I'd take anything they reported with a grain of salt, as they no doubt make their real money from finding something to repair.... but if something stands out it could be a cheaper option.
Failing that, taking it to a dealer, and giving them a brief write up of the issue, when it happens, at what speed/s, etc and what you've tried already, and paying just for a diagnosis, if at first, probably won't be as expensive...
Let us know how you go.