rules wise, I believe they do. If I reference TO in the BA transport section there are optional rules for transport weights of BA ... instead of all of them requiring 1 ton of transport, they get weights based on their class ... from .25 to a full 2 tons. So PA(L), while very light, require a standard BA bay for transport (well, other than transporting gear as cargo and the troopers as infantry or marines).
My unit is only set at "advanced" not "unofficial".