The most common vehicles used in the peninsula are the Toyota HiLux, Toyota Landcruiser or the Toyota Troopy. Generally, HiLux’s come with factory options of two lengths of tray – I’d suggest having a look at the short and long tray specs on vehicles released from 2016 to now.
Another option you could explore is a small trailer based option, however this would need to be suitable for use on rough tracks and in water crossings.
A further consideration is whether your design will remain on the ute tray/trailer when in use, or needs to be moved on and off. If it needs to be moved, how many people are required to safely do so?
Reach out if you’ve got further questions,