When you have a vehicle that you need to load on step deck but do not have loading dock or ramps you still have two options.
1. The vehicle must have a short wheel base for this to work. You can use a rollback wrecker to load the vehicle on the step deck trailer.
2. The second option is not recommended, but still an option. You have to have a trucker willing to back his trailer into a shallow ditch. Then you use 2 x 4 and 4 x 4 to build a ramp. Then you can drive the vehicle on the trailer.