My '03 Sonoma SLS 4.3 4x4 is about to flip over to 100k and is starting to become a money pit. I want to upgrade to a full size but don't want to buy new. I found a really clean '06 Sierra 1500 SLE Z71 one owner clean carfax that is within my price range ($18k). The problem? It has 72k miles on it. That is within the 12k per year average I was always told to look for, but it would be at least 130k when my 5 year loan is up. Plus, I don't know how hard this truck was driven.  Should the miles be a concern? Is 18k a fair price? Are full size trucks generally more well built than smaller trucks? Please advise.
				
			 
	
