tent trailer vertical posts location question


Looking at installing my tent support/vertical posts on the trailer now and wanted to know if there was a calculation or concern as to where to distribute the weight. If the trailer is suppose to be a 60% forward, do you do the same for the 300#'s that I'm dealing with for the tent and frame. My bed is 7'6" and CVT stated that I need three cross bars to be attached to the front and back beams which have to have a span length of 63". I'm planning on using lineal actuators to lift it. I thought about making them 8' and making some more storage to carry stuff