starting issue

I have a 97 Tahoe with a new battery, new starter, and new alternator. It doesn't get driven very often, It will sit for 2 weeks and it'll start up just fine and ill drive it 30 mins up the road to a store or something and when I come back out it will turn over a few times and is dead. It...

I have a 1999 K1500 Suburban with a new engine, new starter, new battery (replaced twice) and still has trouble starting after long drives pulling a trailer of any weight. Haven't tried it without a trailer yet but I have two different trailers and it exhibits the problem with both trailers...