I would be wiling to bet that the choice of tire size was dictated by the amount of space between the rear axles.
There is no room for 44's with the rear axles mounted as they are.
I kind of like the tires that are on it now.
Besides, having to buy 6 44's would probably double the cost of the project.
Dan 84 CJ-7
,Weber,HEI. 95 ZJ