Icy trucks top

So I delivered my load and drove to the truck stop to take a shower. No pull through spots but plenty of easy spots to ally in ,at least I thought. After pulling forward I angle my trailer in noticing I don't have much traction but don't give it much thought. I pull forward to straighten out and when I go to back in the hole I'm not moving, rolling slightly forward. I throw on my drive lock and still not moving, no traction. There's a tractor in front of me close enough to where I can't just get out of the situation by pulling forward or find another spot. I was able to pull up 3 feet and gun it and after two or three tries I got some traction to get parked.

My question is what is the right way to get out of a situation like that or what if I had never got enough traction to back in and not enough room to go forward would I have to chain up of what?

Thx in advance!!!