I am looking to buy an SUV and would prefer a 6 cylinder. I am looking at several with towing capacity of 5,000 lbs. My boat is an aluminum ProHawk boat. I will be replacing my 8 cylinder 1998 Chevy Silverado which pulls it like it is a feather. Any vehicle recommendations to do the job are appreciated and any issues I can expect in downsizing to 6 cylinders.