If you want to fit two zero turns you could get away with the 7x14 but it will be tight,I did it for a couple years and the back mower was touching the gate. But you will need a tandem axle to hold the weight.
And if you do go this route, i would not be using the 4cylinder.. that is a heavy load for that truck. Figure 1500 pounds for each ztr,then around 1000 for the trailer, another few hundred for other equipment and gas and you and whatever is in the truck, and i would be willing to bet you are way over your limit.
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