i would say it matters a decent amount probably 6-7, I think new trucks are less important then, new equipment. but either way things need to be maintained and look good in order to be taken seriously. Like my truck has 273,000 miles on it but it could probably pass for having 150,000 less miles on it. I wash my truck about once every 3 months, unless it gets really muddy then i'll rinse it off. my mower is new and that in my opinion counts for a lot, although my old mower which was 2005 which i bought new only had 983hrs on it still looked new, because it was garage kept since day one, which my new mower is as well. same with my little wonder. I would rate my 16 year old truck at 6 or 7 out of 10. its no where near perfect, but its pretty clean for the mileage and age, and a lot customers comment on it, even though it hardly ever wash it, it stays pretty clean on its own.