Non Mopar,...GM 6.0 V8,...Info Needed

Me and Momma decided on an 05 GMC Sierra 2500 SLE 4wd as a replacement for my trusty, but very rusty 98 Ram. The truck has a long bed, extended cab, 5 speed manual trans and a 6.0 litre V8. Got 58 thou on the Odo,..Runs good and the dealer wants a fair price for It. ...We have a couple at the shop and aside from brakeline issues, they have been fairly reliable. Any one else have a 6.0 gm and have ya had any probs???