I do troubleshoot using an ipad. It's a lot easier than carrying a notebook or netbook. Usually I get an automated or manual alert via email about something (user locked out, NAS running out of space, hung TS session, failed file copy, db restore,etc). Urgent stuff usually has a workaround that can be easily implemented while the permanent fix can be done.
Ipad in had I establish a vpn and then RDP into the offending server, open the tool I need to use and then tap a few clicks or type a few things and the problem gets "managed".
Then when I get to my actual computer I can finish off the work, but in the meantime the users have continued being productive and I have been able to enjoy my meal, time off, movie, family time,etc while spending only a few minutes relieving the urgency of the situation.
I have used this for years now and users and management generally don't even know if i'm on duty or not. drawback is that they usually expect an inmediate answer, benefit is that I manage my off-on time at my convenience without sacrificing service.