I've never scratched wall paper or anything for that matter in a customers house from bring equipment in to the house. Well atleast not in 10 years! Its quite easy actually.
Alot of my jobs are in tenaments, on the 2nd and 3rd floors. And sometimes parking outside is impossible directly outside the job site so a truckmount would be totaly out of the question never mind a porty left in the stair well! lol So your forced to bring it up stairs. Like everything, With the right technique you wont hurt your back or drop it down the stairs.
What happens when you need to turn off the machine to move forniutre OR treat a stain OR change from wand to hand tool? Do you run up and down the stairs all the time? Your going to say get one of those shut of things on the solution line aren't ya

or one of those gadgets that turn off the eletrics via a remote control device. I'm not sure about a truckmount but every manufacture and suppliar I know of says that you need to turn down the pressure of the pump before turning it off. i.e. it wont be such a big jolt when it stops at 400psi for example. Or leaving the pump running while not using it can cos damage. (In the case of a shut off valve) This is the case with porty's anyways so i've been told.
p.s. the comment on the cost of hose was just tonuge in cheek... :
