I have decided to go with a two-position Green Touch Extreme trimmer rack. I have a 5'x10' Carry-On trailer (treated wood deck, 18" expanded mesh sides, 3500lb. axle, 15" wheels). Because the trailer has the expanded mesh sides, the top rails are just a flat plate of steel instead of being a square or round design. I haven't ordered the trimmer rack yet because I'm not sure if I need the extensions that mount in the floor and then to the trimmer rack. Are these advisable, and if so, would you also recommend them for the Green Touch blower rack? I would rather not drill holes in the top rail of my trailer just to test them out to see if the trimmer rack has enough support if I don't need to! Thanks.