[Elecraft] Mobile Grounding for KX3 and KXPA100

[Smedes, Tad - Comcast]

I am planning to use my KX3 and KXPA100 powered by Budipole PowerMini 
and LiFEPO4 battery for field day this year and have a question about 
grounding.  When I am using them both at the home station they are 
grounded to each other and every other piece of equipment in the shack 
using a ground bar and copper straps.  When I use my KX3 by itself 
mobile I have never grounded it and never had an issue.  Is there 
anything special that I need to do do when I hook the KX3 to the KXPA100 
while mobile, and what is it? and or what do the rest of you do when 
running mobile with a KX3 and KXPA100 for grounding?

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*Thanks -Tad Smedes K8TCS N-Scale*