9. GMC Canyon/Chevrolet Colorado
The GMC Canyon and the Chevrolet Colorado were discontinued last year and never enjoyed the success of their half-ton big brother. Separately, the GMC Canyon sold just over 151,000 units in its lifetime and the Colorado sold almost 561,400, selling a combined total of 712,400 small trucks. The small truck market has consistently shrunk over the past five years as half-tons become more fuel efficient, affordable and customizable.