I would add an improved computer: Multi-core, SSD, high performance GPU. Then you would have a number of LCD displays at the various stations that can be user selected to a number of video inputs.
Improve the Autonav to use the LCDs and maps stored on the computer in conjunction with A-GPS and the inertial guidance.
Might as well add a camera/sensor pod of some kind to take advantage of the LCDs and some computational photography with the computer.
While water purification would be neat, I think that is better handled with a trailer for large scale purification. Ceramic filters work for just the team needs.
I do like the pepper spray idea.
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