I think you'll find that seeing as the two skydive operations in Cairns use caravans, and that there are plenty of companies in Australia that also use caravans - doing a few hours skydive flying in one isn't the silliest idea. IMHO a fair percentage of the guys that fly charter and RPT out of good old YBCS (and moving onto airlines such as Royal Brunei, Virgin, Qantas and Quatar) did skydiving at one stage or another.
It's a stepping stone people.