Hi Michael. Thanks for using JA! I will try and help you out.
SuperFlow makes a very good Dyno. I have used their Truck one for years. The reason I like theirs so much is because it measures fuel usage while running on the Dyno. These are the best. You must be bale to measure fuel usage. One without is not as good.
Here is there website.
Click here >> http://www.superflow.com/
They sell chassis and engine Dynos. One of the best around.
Not sure of the exact cost, the one I used years ago costed $350,000.
Please reply back if you need more help or have more questions.