the plate is a basic trapezoid if i remember right it is 32" x 17" on the parallell ends and 20" long. i have the reese tow hooks and i the plate rests on them. i drilled a half inch hole at an angle and then threaded it so there are 2 - 4" x 1/2" grade 8 bolts holding it to the frame. the edges are bolted to 2" x 2" angle iron that i welded together then bolted to the plate. i was going to add a cross-bar but it is stout as heck now. the bottom bracket i reversed and drilled out holes and threaded... [funny story i had the plate on and i had not gotten my 2 bottom bolts yet and went wheeling, i hit a stump underwater and snagged the plate. it did not bend but pushed the explorer up and high centered me - i figure that better than ramming a stationary object with the crossmember] the plate is bolted every 4" with grade eight hardware. if i did it again i would uses steel diamond plate so that i could weld the frame to the plate. aliminum and iron dont weld together well.
ive got the original blue print as an eps at work. ill make it jpeg and post a link here tommorro. this was one of the most fun tricks on the ex as it was fairly easy and is functional and asthetic.