Do you ever think of carrying ( or do they make ) a compressed CO2 cartridge, whippet, etc? I'd think you could do nitrogen at quite a psi and volume, in a canister from a good style paintball gun. Sorry I'm completely ignorant of trail riding but know for sure that if it was me going I'd break down in the worst way, farthest from anywhere, at sunset... and have to pee. At least I could fix the last one, so yea I believe in being prepared.
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