When planning for your 5S, consider sending all of the remote/field workers the 5S Assessment Template so you can get their input. If possible, include them when taking before and, especially, after photos. If they are involved in setting the standards then they’ll have a sense of ownership. The other key is audits. Is there some way to randomly check the vehicles? Part of 5S is Sustain and that means regular audits. The goal is to make it all routine.