The only time I've bothered with grounding when operating
portable, it was to stick a BBQ skewer in the ground to drain
the static charges off the antenna. (The capacitors were arcing
over every few seconds without it.) But that was a pretty
highly charged time: other than something like a kit supported
wire, it is rare to have that much static buildup (at least not
without wanting to take shelter from potential lightning).
(I've mostly operated from areas where lightning is rare, and
would avoid operating if it there was a potential storm. But
lightning protection for a portable station is a much bigger
project.)
If you have problems with the rig being hot with RF, then you
need to fix your antenna. Adding a quarter wave radial to the
tuner case, or using an effective balun, often will fix the problem,
although a choke alone isn't always adequate to suppress the
common mode current if it doesn't have an alternative path.
For a VHF antenna on a mast there is no need for station grounding,
unless you are tempting lightning, then you shouldn't be
there anyway.
Unless you can clearly articulate the reason why you are
adding grounding, there may not be any benefit to it.