Main chat hud length?

I found a tutorial that shows me how to add triggers that will print a message to the main message Hud, but I need the limit to be larger than 255. Changing the maxlength in mainchathud and chathud and messagehud don't seem to have an effect. Basically I want my students to walk through a trigger and information about where they are shows up. For example: the message Hud talks about the way goods were shipped in the 27th century. Does anyone know how I can make the messageHud expand it's limit of 255? Is there a better way to do something like this?