"We got hit hard by the viruses that have been hanging around up here this season so we sent a whole lot of horses home to be spelled," says Dunn. "Then they can train up down there and come back when the time is right.
"It is not as easy winning races up here as some people might think, the racing is hard and because the fields are small it is easy for horses to get up in the grades quickly.
"But I am happy with how the northern stable has gone and we have a foothold now before the stakes are set to go a lot higher next season so our long-term plan is coming together."
Although Dunn is acutely aware the ability to race handy is often crucial at Alexandra Park, he says Woodstone (race five) and Sundees Son (race seven) are good enough to get back tonight and still win.
Woodstone has been outstanding since coming north but will give his rivals a start in the $40,000 Uncut Gem Trot, a Jewels consolation.
"I think he is a horse better not rushed early and able to get into a rhythm," says Dunn.
"He was massive winning last week and while this is a good even field he can win again.
"He really loves it right-handed, which is another big factor in picking which horses to bring north."
Woodstone will have to beat four reps from the Michelle Wallis-Bernie Hackett stable, who won three trots at Alexandra Park last Friday and have been two of the biggest supporters and therefore beneficiaries of the ATC's emphasis on trotting races in the last two years.
All 31 of their wins this season have been with trotters seeing them lead the national premiership for the gait.
Sundees Son is way better than his formline indicates and with peak concentration he can beat the older horses.
"He is good enough to win but he needs to be looked after early and not get into trouble, which he is pretty good at doing."
The Dunns won't have to rely on such luck with Billy Badger in the $40,000 Uncut Gems for the male pacers, with the talented pacer likely to try to lead and make hot favourite Classic Brigade chase him, which could make them a solid quinella bet.
Park picks
• Best bet: Classie Brigade (R8): Impossible to go past him after comeback win last Friday.
• Jewels tip: Opoutama (R6): Fourth in glamour event at Jewels from poor barrier suggests she wins tonight.
• Improver: How Great Thou Art (R10): Big run in stronger field last start and better drawn tonight.