The best bike to use here is the prototype Kaneda that is unlocked after completing the Ronin mission line. Cars are safer than bikes, but if you are unable to reach a certain platform with a car, you’ll have to use a bike instead.
The type of vehicle used doesn’t really matter for most, since you almost never have to fly that far for it to register. These jumps are quite easy to spot just travel to the area marked on the map, search around for the ramp, then get a good run-up and drive off. There are a total of 80 of these stunt jumps in Stilwater.
Some ramps and natural inclines act as stunt jumps.