I've used Diamox several times for high altitude places (e.g. Denali, Kilimanjaro) and I find it a tremendous help (I've had altitude problems at 9000 ft.)
I went to Denali twice. The first time I had Diamox just for emergencies, and didn't use it, as I didn't understand enough about it. That time I basically didn't sleep for 2 weeks, as I would wake up short of breath throughout each night. My second time there I used 125 mg. at suppertime, and it made a huge difference. It really increases the respiratory depth, and therefore one gets more oxygen. Since then, if I'm at altitude I use 125 mg. twice/day. It doesn't mask altitude sickness, just helps with breathing, which can prevent altitude sickness.
As for side effects, I didn't particularly notice increased urination, but there was plenty of tingling of fingers and toes and occasionally arms and/or legs, which didn't bother me. The tingling was periodic for me, not all the time. If you're just going 2 nights at trail camp, then you would only need it for 4 days total (2 days prior to altitude to start) and maybe won't have as much tingling. I've used it for weeks at a time.
Hiking somewhere at altitude and spending the night at altitude are 2 different things. I certainly would use it if sleeping at that altitude, especially if I was coming from sea level beforehand. Others, if well acclimatized may be fine without.
