Some info, from left to right: Lancia Esatau (now well know to everybody 
), Lancia 6RO (the same Esatau engine but with 5 cyl), Esagamma 519-520 (the last model built before Iveco globalization), Alfa Romeo 1000 (called “tenerone” means not a strong truck).
I have a little collection of old fiat and Lancia in good digital format, if someone is interested in write an e-mail