I'm a building engineer, i carry Leatherman with me al the time, it is extremely useful, but it has it's limits, I do not see it being much useful to install a sink, i mean you could use its saw to cut out an opening for a sink in a countertop, if it is a particle board one, or a plywood, it is possible but it is like washing a floor with a toothbrush, then you got 6 to 10 clips that attach the sink to the countertop, usually there isn't much room for a hand with a multitool there to move around, you either need a long screwdriver, or a socket with an extension. multitools are great weight savers, it gives you ability to do some work without having to go and get your toolbox, but It is NOT a replacement for the right tool for the job.
as far as camping, hell yes, i never go camping without one, or two, Leatherman wave+ is the best for camping in my experience,