For the jobs the OP wants than a small (250W continuous / 500W surge) quasi sine wave (ie cheap) inverter powered from a cigarette lighter socket should be fine.
There'd be very little issue in charging from the starter battery when actually driving along as the alternator should easily cope. This way the item being charged could be kept in the cab and easily to hand - might be handy for the camera.
When not driving, the same inverter should be plugged into a cig socket connected to / otherwise powered from the leisure battery only, as a laptop - especially if actually booted and used whilst it's charging - could deplete enough from the starter battery to cause starting problems.
This assumes all the electrical hardware is in good condition and there is a split charging system on board that isolates the leisure battery from the starter either automatically or manually.
Last edited by crinklystarfish; 1 Feb 2012 at 09:54.
Reason: Spelling
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