Miller, Waitoa and McConachy, who is fresh off a second place in the New Zealand Highland Heavyweight Championships at the Paeroa Highland Games, will be up against some challenging competitors.
Winner of the New Zealand Highland Heavyweight Championships Craig "Lifts 'n Bifs" Manson, of Ashburton, will take on the Palmy team, alongside Reuben "The Man Mountain" de Jong, of Auckland, and Andrew Wain, of Tauranga.
The six Highland heavies will compete in five events across one day - the 56lb weight for height, the Ford Ranger ute push, 28lb weight for distance, caber toss and 94kg to 158kg stones.
Miller's favourite event is the caber toss, a crowd favourite traditional Scottish athletic event in which competitors must lift and toss a large and long post called a caber.
The objective is to toss the caber end over end, so it falls in the 12-o'clock position away from the competitor.
"I enjoy the caber toss. I'm not very good at it, but it's one of those events that is synonymous with being Scottish."
McConachy is also a fan of the caber toss and says he has spent time practising on the field of a local primary school, where he is a teacher.
"It must look very interesting to passing motorists."
The pair have been putting in the hard yards in the gym and field to prep for the event, as part of their regular Highland and Strongman calendar training.
They agree the event is an impressive one and not to be missed over the Rural Games weekend. What makes this competition unique is the fast pace, with five events packaged into a two-hour, crowd-friendly window.
"It's always great to perform in front of a home crowd in a really unique event in our city centre, and who doesn't want to see big men in kilts throwing heavy things around in The Square?" McConachy says.
The Details
What: Southern Hemisphere Highlander Champion
When: Sunday, March 14, 12pm-2pm
Where: Te Marae o Hine - The Square
Entry: Free