In my experience its common. But you can schedule your personal inspection and business dealings on the same day as your demo. They should work with you on that request. But its common in cars and RVs to demonstrate after the sale.
No man has a good enough memory to be a successful liar. Abraham Lincoln
2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch