Buggycar, Pullcar & Premocar are correct. (Am not familiar with that info on the "Buggy Car." I found that pic as a 1909 Buggycar, not a Postal Buggy.)
Powercar is not correct.
BTW, at this point I'd like to brag a little about my photo manipulation on the Dewcar & Pullcar. As with one puzzle I solved earlier (Medinger), the only photos of the makes that I knew of were as recognizable for the people in the cars as for the cars themselves. So, in order to keep the focus on the actual (Dew- & Pull-) cars, I took out the people -- using only Microsoft Paint! (Didn't take that long, either.)