What is the best trimmer rack that holds three for an open trailer. I am looking for a rack that is easy to operate and cheap. 100$ or less is what I want to pay. I am looking at one on www.precoparts.com for $75.00 Is this one any good? It looks like I need a padlock for each trimmer. I don't know if this is good or bad. If the locks are individual, I only risk forgetting to lock the machine I use and not all three.