There are a variety of models out there. Haulmark and Wells Cargo probably the best.<br>You will want roof vents, and not all ramp doors will hold the weight of a commercial mower. Counterweights on the door are a must, and get a side door also. You WILL use it. Most axles on good enclosed trailers are Dexters tortions rated at 3500lbs. If that is enough, fine. If not get a tandem 7000. What are you pulling with? Brakes are required on all enclosed trailers carrying 3000 lbs or more total weight(including trailer).<br>Whick means, you will also need a brake controller for your trucks. Also a breakaway is required by law (About $80 installed). Don't go less than 6 foot wide. <br>Some drop gates also do not span the entire width of the trailer. Check into that. Extra room will be filled quickly, so do not be afraid to go big. Keep in mind you could get 3 open trailers for the price of one enclosed. Check out the websites of trailer manufacturers, and get back to me if any more questions. (Dont forget about tonque weight). If you plan to put your name on the trailer, keep it legal, because DOT will be watching.