Rainier is Buick’s mid-size, truck-based SUV. Its closest relative is the GMC Envoy. With its sliding rear roof and hose-friendly hold, Envoy XUV keys on cargo. With Buick, the priority is on the passenger compartment. Rainier is offered in 4x2 and all wheel drive versions, with two engine options (I-6, V-8) and two trim levels (CXL and CXL Plus). My test truck was a typically equipped Rainier; a V-8 powered CXL, with all wheel drive. With a few options added and the destination charge, the big Buick stickered for $40,815.Because of the popularity of the breed, SUVs are a diversified lot. Count Rainier as an urbanite; it is far more likely to be found in the canyons of a city than it is rolling along a rocky trail. This class of ute is generally called upon to be equal parts station wagon, tow vehicle and all weather transport. It’s well suited for all roles. Rainier has an understated, well finished interior – at the top end among GM entries. Up front, the leather trimmed seats will adjust to fit most any size passenger.