I live about eight kilometers from Gaza, the aid trucks are on all the highways at pretty much capacity, and it's been like this for quite a while. I really don't see how much more aid could get in without building more infrastructure, and in fact there is a new port in the strip being built (maybe done already).

It should be noted in context that even bringing in aid is dangerous. The population attacks the aid drivers for two reasons (one, to get the aid, and two, they consider those drivers "traitors" and have been attacking them for long before the current conflict). And there is not insignificant risk to the Gazans as well, there was an incident a few months ago where an aid truck ran people over trying to stop it and some people were killed in a very gruesome fashion.