That's one reason I picked the NAPA rotors... much less holes.It has been said in various forums that drilled rotors are not a good idea on these trucks due to the weight, especially when towing, and therefore the heat they produce. The holes can lead to warping and cracking. However, a lot of guys use them and I've never heard of anyone having problems doing so. Since yours have less holes than others, you'll probably be just fine unless you tow big loads a lot, particularly in the mountains.
-Jay