agree with fix axel seal
check everything, look for leaks, slop in suspension, anything in question do now not on the road.
I did my axels, knock sensors ( threw a code of course a week b4 trip) and went through everything and changed every fluid last march b4 the trip from Oregon to my new home here in alaska
also I guess im just a old fart that does not need big power anymore.
a few weeks ago I had to tow a 22 foot SJX boat from Fairbanks to the chitna and back ( the above alaska guy knows the trip, 7 hours each way, and yes nearly limited out on salmon,58 in one day, 65 is max for the household permit). yes gutless and poor mpg.(13)..but now not a big concern to me and I was actually happy how the old girl did,
would I do it again, not really, but the trip was planned and the other rig ( diesel pick up) had to pull a horse trailer those days....but if I had to I would
esp for dem fishies
my son leaves Friday night for the kenai with his taco and the boat...because the darn big rig is pulling horses again
think I need to invest in another big rig