1972 c10 Draining Radiator

[Mike_The_Grad]

Hey everyone,
I'm wondering if any of you guys have come up with a good way to drain the radiator without making a huge mess everywhere. I recently installed a Northen Radiator 4 row copper/brass radiator in my 72. Its an awesome radiator, feels heavy duty. Nice gloss black paint. Dropped right into place and all of the ports line up where they are supposed to. The only complaint I have is that it sprung a super tiny leak where the upper transmission cooler line connects to the radiator. Yes it's a small leak, but a leak nonetheless. Repairs are covered under warranty. Downside is it has to come out of the truck.
Anyways, I'm currently using a homemade funnel wrapped up from a 12-pack cardboard box. The radiator has one of those plastic wing nut type drain plugs in it. I was considering piping in a 90 with a small drain valve aimed down in between the drivers side bumper bracket, inner fender, and power steering gear. I dont anticipate having to do this again. But that's what I said when I put the new radiator in about a month ago.

Let me know your thoughts or what you guys have constructed to accomplish this less than pleasant task.