A 1500 truck is hard to beat. A 6-cylinder will tow a 2,000 lbs boat no problem. If you want to go with an SUV and stay in the GM line-up, the replacement for the Trailblazer is the Acadia/Traverse/etc. Make sure you get one with a factory ordered trailer package. They have extra coolers installed at the factory. They do tow quite well and are rated for up to 5,200 lbs. The Tahoe/Suburban are built on a 1500 platform and are a great choice (but more money).