Maybe they could try this (before going on the beach)?

In all seriousness track retrofits tend to do really poorly outside of snow.

You can get them on UTVs (side-by-sides). They also suck there, because if you try to reverse over something you can pretty much rip the track off

An argo, dollar for dollar, is the best thing to take into the bush.

This Argo? (was the first link in the argo car search)