Sounds weird. Citroën never sold the (1939+? / 1942+?)
TPV, the
AU (i.e. fourgonnette / van) was made in 1951 directly with the "normal" 1948/49+ body, and I never saw mention of any
TPV Van prototype. But hood, fenders, wheel rims and cyclopean headlamp look indeed like the ones of a
TPV...
For the record, the
TPV was apparently scheduled to be classified as a "light motorized quadricycle" (less than 300 kg/660 lb), which authorized it to have a single headlamp. This latter was not due to any French law involving "normal" cars, as one can read in some articles or sites.
But DynaMike could certainly say more about all this