We cannot afford aluminum. So, we are looking for a new stock type steel bumper pull trailer and two basic designs have people who swear by one or the other. The first type is the standard, the kind of stock trailer common in all states. Slated sides, escape door, basic step up.
http://cmtrailers.com/livestock_trailers/cm-stocker/
Then, there is one common in the South with much more air flow, round barred sides and a canvas top. You can see the horses inside very well and they do get wet when it rains, lol.
https://www.texastrailersfl.com/st1070b-texas-trailers-10-bumper-pull-stock-trailer-BNt|yz.html
These are the best examples I can find.
Southern folks, which type works best for you? Does the more open type last longer? We haul horses, cattle, sheep and goats.