I got my Diamond Eve exhaust from Treasure Valley Diesel (tvdiesel[dot]com) for my 94 ECLB pickup. Everyhing fit real good with the exception of one hanger that I re-bent to make it fit the way I wanted it. You do have to cut some of the pieces to length to fit your vehicle as I think the kit is generic to fit either the regular or extended cabs. I'm not sure about how the exhaust will fit the Suburbans.
The kit I got came with a flow through muffler. It is a bit louder than the stock system, but not obnoxious, until you put your foot into it hauling a load or towing.
My kit was shipped out of Athena,Oregon. Athena is a little blip in the road north of Pendleton in northeast Oregon so shipping to your dad's place won't be a problem. Your dad may want to beef up the cardboard packaging for international shipping as there is a fair bit of weight there.
Don