Had my first game against Hussite battlewagons tonight  and my opponent upgraded one base in each TuG to include light artillery.

When I charged them he claimed that my troops had to undergo the KaB test for charging guns/cannons.

I thought that applied only to the artillery UGs listed as guns and cannons  rather than bases upgraded to light artillery shooting, but could see his point that I was in fact charging into guns.

Was he right?

I believe he was as they are "guns mounted in wagons".

Another point came up in the game.  Can a war wagon be overlapped as it is has barricades all around?

Do barricades stop overlaps?

Do not think they would and do not think it says anywhere that they do.