General Motors Corp. and Isuzu Motors Ltd. have joined forces to develop the next-generation S-10 family of small pickups, a program expected to yield 500,000 units annually — the largest project undertaken by the two in their 30-year partnership. The Isuzu-badged concept truck, recently unveiled in Tokyo, will give way to production versions for both Isuzu and GM with distinct exteriors. The joint effort leverages resources and engineering expertise, says Isuzu President Yashinori Ida. The Chevrolet Colorado/Isuzu pickups will be built in Shreveport, LA, as well as in Thailand and Brazil.