Toowoomba range is shorter, but steeper - dual carriage way up and down. Cunningham's Gap is longer and less steep, but I "think" some sections are only one lane downhill. A lot of Cunningham's Gap was washed out in the big wet last year and it's been under repair for over 12 months.
Biggest load I've ever towed down those is a camper trailer, but I'm sure a sensible fellow like yourself wouldn't have trouble with either if you take it easy.
DT
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