Lifting the cab

[Matt_50]

I've been searching and I want to make sure don't any mistakes. I need to lift the cab off my 1950 3100. I made a rookie mistake, I did not inspect everything very fully and I found out my front passenger cab support is rusted through, see pic.

Anyways, my truck is on a concrete slab in the backyard. I have a cherry picker and I've seen pictures of guys using a jig on their picker to pick up their cabs. To replace my support I am going to pick up the cab, roll the truck forward, set it down and roll onto firewall. I was thinking it's back but thought that might damage it and was told the firewall would be sturdier.

So I have a new support ordered and I got the doors off, figured it was bad to lift on doors. I don't want to damage the cab... any suggestions? Thoughts on support replacement? Rolling onto firewall?