Hi Dion,
Great question!
I’d like to throw this question back to you – Dawul Wuru imagined a trailer design would be the most appropriate and affordable way to carry the tank, what benefits would a custom truck design have over this? If you can come up with an appropriate, affordable design of a custom truck that can transport a dugong tank you can certainly pursue this route, however a custom truck is likely to cost a lot more. If by custom truck, you mean a modification of a standard, commonly accessible truck / ute with a tray / 4WD design, then this may be more feasible.
I’d encourage you to think of the benefits and drawbacks of a custom truck design vs a common trailer and how you can justify this in your design proposal.
Hope this helps, please let me know if you have any more questions!
Good luck with your project!
Rachel