Again, personally I don't care if any of these TD's do or do not have camo (aside from maybe hetzer/jagdpanzer, but that's only because they already have a dodge modifier and decent armor), but I also don't think camo is the main issue with TD's. I discussed my thoughts and proposed a different means of approaching the issues regarding the issue in a new post, here is the link.
viewtopic.php?f=15&t=3588