depends on how/where you camp - we do LONG road trips (1000 mile days) to/from houston & northern virginia - we overnight in rest areas.
Having a dump tank on site at our storage lot makes things that much easier.
I also go to a lot of races where we dry camp, track side, for 3 & 4 days at a time - there is no dump station at most tracks.
With a dump tank at our storage lot we never have to worry about finding a dump location or PAYING (petrol/fjlying j).
Having a dump tank on site means i can leisurely & thoroughly rinse our tanks before storing the coach - i don't have to rush when doing so (like at a road side rest area or flying j).