Going to replace my current Dodge 2003 4x4 quad cab with a 5.7 quad cab 4x4. Looking at the 3rd and 4th gens used. Any specific things to look at on these used TRUCKS? Anyone got an opinion on whether to go with a 3rd or 4th gen? I can find both with decent miles and price, just wondering if one gen seels more bulletproof than the other. Thanks.