A nice option to make the walk a bit shorter and without sustained uphills while also having a shorter car shuffle could be to park one car on Delicia Rd South of Gheerulla Falls like Richard has suggested. But instead of parking your other car at sam kelly rd you park your other car further down Delicia Rd where a gated fire trail leads down to Thilba Thalba walkers camp (just make sure not to block the gate as this is the emergency access route for the camp). Doing this you could start high seeing the view from the Thilba Thalba camp and the viewpoint before winding down to the valley and then making your way up the valley to Gheerulla Falls and then a short walk to your other car. This would save you about ~7.3kms of walking making your day ~13.9km rather than 21.2kms and be quite a quick and painless car shuffle from your accomodation.