What a stupid statement Barry.............
First of all.............not many would be prepared to spend 3 hours travel time for a job that appears to worth around £300. If you imagine the client is prepared to pay you for sitting in your van you're nuts.
I know you said T/M owners only, but most of today's T/M'ers would use a rotary on the carpets and most of the modern portables will run a T/M extremely close on upholstery cleaning............where it's more to do with products, hand tools and individual ability.
Curious to find out what's to be " revealed "
Incidentally, If I was spending the full time involved in this job actually working then I'd be looking for around £450.