Is there any way to keep Dropships, Rockets et al to only allow for a certain level of mass or a certain number of passengers?

What I want is for it to be impossible to order equipment / troops that exceed the craft's weight / passenger limits, so that different craft can be more strongly differentiated.

It makes no sense that a Rocklet can contain a tank, for example. Is there any straightforward way to do this, other than inventory manipulation via Lua when spawned? I'd like it to be as transparent to end-users as possible and preferably stop them from being able to set up the buy action in the first place.