Ii agree with Caravan Oracle about service time being at least 4 hours in duration to do a thorough service correctly.
If someone is doing it in 2 hours I would be very worried about what they had NOT done, and seeing him testing the rise and fall of blinds is not a critical item, unlike other much more important areas of test.
As an "Approved Mobile Workshop" my customers can watch every aspect of the service and ask questions as they want and I resent the implication that mobile service is inferior.
As for raising vans on ramps, it is not necessary, nice if you have them but many fully kitted workshops do not have them, but as long as you can get under the van with the wheels off the ground,on axle stands, you can do all that is required.