I always save bungalows to do at the end of my days work lists, so when the tank is empty I do those.
I will get a bigger van eventually but I cope with my little 250lt tank. Did a school the other week and managed ok with it. When the commercial side of things pick up I will move up to something 'Vito' sized but at the moment I manage ok.
The only reall reason I'd get a bigger van is to put a thermopure system in.