Problems or not enough truck

[poli]

I recently purchased an '01 F550 4x4 automatic, 257,000 miles. Seems to run ok by itself but when I hook up a loaded gooseneck trailer not so good. Trailer is 32' (7,200 lbs). Skidsteer is 14,000 lbs. So around 22,000 lbs total. Takes quite a bit to get underway. Then will do 65 ok on flat ground but throw in a slight incline and it drops to about 45 with the pedal not floored but pushed down most of the way and the transmission shifting down. I've never owned a diesel before so..... is this normal, something wrong or just not enough truck for this load. Thanks in advance for any thoughts.

[countryraised]

Something is definitely wrong, start by doing a full service, oil, fuel filter, check over all the pressure boots, tighten down all the clamps to stop boost leaks.I haul more than that with my 350.

[poli33]

How can I tell if my turbo is working? Is it supposed to make any noise -- whining, etc? I can't hear anything and using a mechanic's stetheoscope I can't hear anything at idle and no difference when revving up (please excuse my ignorance if it's not supposed to make any noise). Could this be my problem -- turbo gone south?

[greasyF250]

It would most likely smoke black, like crazy , if the turbo was shot.

[greasyF250]

Do a compression check low compression will hurt you bad.

[ianstew]

F550 should have plenty of grunt for what yer doin', i'd say you've got some issues, 257k is alot of miles.....do you know if the truck was maintained well? I'm bettin' tired injectors.........lower compression, dusted turbo, etc