I don't currently have a back up machine and I'm aware I could get caught out by this. The issue is that a cheaper back-up machine is unlikely to have more than 135psi and I have a Wonderwand. And I've never used a regular wand except for a 5 minute try where I really couldn't get the hang of it. Would a 135 psi machine do in an emergency?
Alternatively I can bite the bullet and invest in a bigger van and new machine and keep the existing porty as a back up, which is the braver way forward I guess.
Hmmmmm (again)