Today I tried this wierd combination:
3M Airush trainer with roller blades on a grass lawn.
The wind was 20-25 km/h. Going downwind was easy and fun but I
couldn't climb at all. I think if I try on a better terrain (better
than grass) it would be possible even to climb (but also more
dangerous). The challenge though would be to find such a wide area
covered with asphalt or cement and without any street lights or
trees. Any ideas?

Cheers,
Kamen.