According to "The Model Railroader's Guide to Intermodal Equipment & Operations" by Jeff Wilson, he states the wedge design.came into use in the 1970's for what that's worth. The questions of length iand logos I can't answer. And those I have known who would know have sadly passed away. Wonder if another photo hosting site would have some examples?
As far as Hank's Truck Photos demise I believe it was due to people who were taking copyrighted photos and passing them off as their own on other web sites and he was tired of dealing with that. I wasn't on the forum side of it that often but the word on a couple other truck forums say it had to do with paying much of the cost out of his own pocket. Either way I miss scrolling through the LTL company photos and the memories that triggered.