Simple brand new Dyno the front rollers then have to be setup and did you forget to check that on this dyno they do a mixture run first to make sure your car is happy enough to be run up .
yes you can get a dyno run for $35 here and there but this is on a saturday the workshop does need to pay bills, if i had a new dyno i would not charge $35 a dyno run its just not worth having one.
back in the day dyno runs were 50 - 70 for 2wd no matter where you went.
you don't have to come i just thought the 4wd people would like an option
cheers