Google Analytics Site Search w/ WebHelp

Hello! I have a WebHelp project that I'm currently getting Google Analytics data on (yay for Master Pages!), but can't figure out how to get Site Search Tracking to work within the pages. I've tried multiple query parameters (rhsearch,s,r) but it's not recording anything. Am I missing something here as it has worked fine in the past on HTML5 projects? Is this a limitation to WebHelp only? If so, is there a workaround (or another search product we should be using)?

Thank you in advance!