A local mower shop here used to carry these Grid Iron racks and only has a 3' post set and a cooler rack and blower rack. I can get them at a decent discount and could use these. My question is, the poles are 3' instead of 4'. Obviously I am limited to some degree here. They mount to the floor also I believe so I would lose the first foot due to the side rail on my open trailer. So what do you think? Right now just the 2 uses would be nice but will I be able to add in the future? Or should I only get 4' set of poles.