Mobile Gap Gen has been a pet peeve of mine ever since I started playing this again. Why the heck can't you see the truck whilst inside the dome? From a gameplay standpoint, it makes no sense as the allies should be fighting tooth and nail to keep the soviets from outside of the dome. I have way too many folks just driving up and running a Gap Cloud against me and my fellow comrades and I'm too pleb to find the truck whilst in a tank. Renders prove that you can see the Gap Gen when under the cloud too. Don't know if I'm the first to complain about it, or if its due to engine limitations but I feel this little quirk gives a rather annoying tactic to the Allies.
http://vignette4.wikia.nocookie.net/cnc/images/4/40/Gapgenerator.jpg/revision/latest?cb=20080328134558 I'd post an image of the render, but the forum won't let me.