We’ve added the optional requested_capabilities parameter to Optimize Route¹ and Submit a route optimization². Pass the capabilities³ of the vehicle that will drive the route — the same object Estimate route time of arrival and distance⁴ already takes — and the stop order, distance and duration are calculated for that vehicle.

When it is left out, or does not select a vehicle, the vehicle is still derived from the stops being optimized. Invalid capabilities³ are rejected with a validation error.