I just got the thumper pack for my T5 to run 12V air compressor and a small fridge.
And so far I’m very happy with it.
I can use it in Treg as well as in my van. It should be able to run a small portable fridge for 2.5 day and recharge in 4-5 hours of driving.

Inside the thumper pack are 4 sealed led acid batteries to make 60AH or whatever capacity is written on the label. The box is reasonably sturdy for carrying in the vehicle. It comes with quality jumper leads, which are fitted with an Anderson plug and in the vehicle charging kit. It can recharge from battery charger or regulated solar panel. It also has inbuilt digital voltmeter for checking the battery state of charge.
And the last it is Made in Australia.