is the quality of their fitting and balancing comparable to regular machines?
Do they have some sort of portable unit?
What etyres do is have contracts with local garages equipped with mobile fitting units and pass the work onto them. In my case Gordons Tyres in Wakefield came out with their mobile fitting van. To be honest I didn't hang around and watch the guy fit and balance them, so can't comment on the fitting/balancing method used, but I didn't experience any issues whatsoever so that was good enough for me.
