Time to simplify -- fiver to TT. Do I need WD?

I have used my 2013 2500HD with no special hitch to tow the same trailer as my 2012 1500 with a couple of different WD hitch setups. Much better with the 2500HD. I suspect it is also much better than your fifteen year old model. We all get to spend or not spend our money as we want. However, you might want to try a test tow with a late model 2500HD before you state what it needs to make it a great tow vehicle. You might be surprised what GM has accomplished in the last fifteen years.