People who live #vanlife tend to fall into three categories.
One are post university digital nomads that work remotely anywhere they can get a solid broadband network. Coders, software dev. Customer service reps with VOIP.
Two gig economy nomads, that work gigs like uber,doordash,lyft ect... Or odd jobs with high turn over or seasonal opportunities like waiting tables, or bartending other personal services like fishing / hunting guides, or personal trainers / nutritionists.
Three trust fund kids who have independent means of income or day traders but really day traders fall into group one.
of those, only gig work would seem applicable.
Shouldn’t FBI already know a mileage radiuus for where he could have been dropped off assuming the truck/camper return date is known?