Can you drive to the top of the pass and then turn around and return to Hwy 550 in a regular pick up truck. I've seen vids of the section from the Stairsteps into Telluride and I know my truck is no...
Before you get anywhere close to where it goes down the steps there is a lot of rough terrain to cover, IMO, the answer is no unless your pickup is high clearance and 4 wheel drive.