making a trailer

[oilcooled :)]

we were looking at buying a tractor trailer for the farm, but an double wheel truck axle came up local so im buying it, but anyway i hate buying something that i am able to craft myself. but like the titeen i am i deleted solidworks of the computer when i finished the leaving certificate. thinking id wouldnt never use it agen. anybody have plans for 11 or 12 or 13 by 7 ish tipping tractor trailer