Step 1 - Place the ramp flat on the ground and lead your pet across with treats. Treat frequently to encourage your pet.
Step 2 - Once your pet is comfortable with the ramp, move the training to the vehicle that will be used.
Step 3 - Treat your pet frequently walking up and down the ramp until they are happy and comfortable walking on their own.
Step 4 - When your pet is walking up and down the ramp independently, treats are no longer needed unless desired. Pack up your ramp and hit the road!