no clue where else to look. the truck has been to peterbilt and we cant get this under control. my dad has a 98 379, airtrac suspension, low pro 24.5 tires. the trailer is mesuring 13'8" the truck came from the factory with the tires, and it has a low pro 5th wheel. no idea where else to turn. help! i was told lowering the adjustment on the rod will blow the rear ends. no clue what to do.

Is the trailer a high cube van? If it is then he may not be able to get the hight down lower than 13'8".

nope. just a normal great dane trailer. 13'6. he's had it over a year never had a problemw ith his t800 and i pulled it with my columbia no problems. i'm starting to think its the air trac

What's the 5th wheel height? Has the air suspension ride height been adjusted properly?

honestly i do not know the hight. he's swapping it out for someone that has a lower profile 5th wheel. the suspension was adjusted by pocano pete the other day.

We have a 379 with a airtrac suspension with 24.5's and it seems to sit just a tad bit higher than any of the other trucks. It's not normally a problem being we don't pull vans. If we do hook it to van and the driver remembers he just lowers the ride height.