They do make AWD Dynos but they are hard to find. As the car/truck world offers more AWD vehicles, they will be more of them.
Disconnecting the front drivshaft for a dyno run is a fine way to get data--certainly AWD data is more accurate but two wheel data can tell you a lot, especially for comparison purposes.
I run my H2 without a front drivesahft full time. I need to minimze losses on 1/4 mile runs.
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