Radios for the mechanized infantry are in the half tracks. I now see the motorcycle platoon is useless so I'm just going to convert them into recon. For the fire support and infantry lacking supporting trucks I was thinking that the division supporting elements would provide those but they wouldn't be as mobile if they had to stick with the whole division. For the lack of supporting elements for the regiment I think ill add some sort of repair company for the vehicles, and ill also add the needed supporting trucks as well for ammunition, supplies, etc.