I've bought/developed websites over the last 3 years whilst at Uni, so obviously a bit bias. But from personal experience:
Getting numbers off a Van for something you need on the move is hard. It's easier to remember a company name & website, especially if they are similar. (ie, LM cleaning = lmcleaning.co.uk). I'd say your website name is easy to remember...
I'd focus on getting the website built in the same colour as the logo and directly underneath...then "Just ask for a quote" underneath that...Bold up the phone numbers.
My experience tells me the only time I've managed to get numbers off vans is when I'm walking past them and they are at the side of the road etc