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For rolling resistance I thought you could push it at a constant speed, and measure the force required, and then another speed, and measure the force required, and get a line from that. So remove the halfshafts, and push it 2 mph (measure the force), and push it 5 mph (measure the force). Even if the short test stretch of has a slope, you can back out the effect of that by using the same stretch each time you test. You use a low speed to keep aero effects out of it. You're smart enough to do big piles of math, but you are also smart enough to know that nothing beats actual data.
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