What does 30mm work out at – in reality, not in theory?
Closer to 1/48th than 25/28mm anyway so you have all those vehicle kits to choose from, in particular the cheap, one chassis fits all, motorised AFVs from Zhengdefu/Kitech that actually build up quite well. The advantage is that in a near future setting you can start to play silly buggers with them, so I have an M1 with a turret mounted point defence system (from the John Ringo Posleen War novels) and a LeClerc with an Ogre style sensor tower (a terrible mistake, the American Ogres, not the European ones mounted these).