Not in any way affiliated, just sharing this solid looking rear bar for the 250 from Aussie specialists TCC that I came across. One of the nicest looking spare wheel mounts I've seen and seems really well engineered from the YouTube demo. They've got a front bar in development too apparently. I'll bet ocean freight from Oz would be painful though.
Toyota Prado 250 Rear Bar
Enhance the strength and versatility of your Prado 250 with our Rear Bar. Built with precision & featuring unique design! The Best Prado 250 Rear Bar!
thecruisercompany.com.au