I called a dealer a few months ago asking about whether or not it would be possible to have grab handles for driver and passenger side A pillar.
Took a few days, but the guy I spoke to told me that apparently there are airbags located there that make not feasible to have grab handles there.
There is one that is standard above head height on the passenger side, but it does seem that those with retail Explorers with 16+ MYs are out of luck at this point.