LT225/75R16 Load range E are “Light Truck” and not the same as the 225/75R16C where the C stands for “Commercial”. The difference in maximum load capacity is significant.
This particular size is common because it’s offered in the ProMaster van as an option. The standard tire is the LT and the optional one is 225/75R16C.
Ford also uses C (commercial) tires on Transit vans but in different 16-inch-wheel sizes. The larger on SRW Transits are 235/65R16C, which have similar load capacity but are a little smaller in diameter so can’t be mixed.
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