just did mine a few weeks ago. fan belt at freightliner was $60.37 and a breeze to put on, maybe 3-5 minutes with a break in the middle
now the water pump v belt was only $14.32 and could of been a bear
the secret on it was to loosen the idler tensioner till almost off to give room to get belt off.
most of mine was done up top and the lower was easy to see.
bet a dealer would gig you for 2-5 to 3 hrs when you can do yourself with a couple tools in way less than an hour

they charge book time flag hours, not actual and a good tech can flag over 100 hours but work only 40 or less a week.
if you need any pointers or part numbers please ask.
this is also on my 2000 tradewinds 300 cat
ps done ALL hoses to and can give part number,
PSS put new bearing in your idler to, only about 16.00 at cat versus over 100 for a new complete unit.