To raise the roof is not so hard but you have to be prepared. First I made sliding guides. I used 1.5" square tube and 1.25" square tube:
And welded this guides to bus posts:
I made 4 of this and this was enough to hold roof while I was raising it.
I used 4 farm jacks to raise the roof. I also screwed 4 2"x12" wood blocks between posts in each corner:
I installed 2 6"x6" fir posts across the bus and screwed them to wood blocks. The farm jacks were pushing 6"x6" posts up. Unfortunately I lost some of my pictures but it is self explanatory.
The roof is up
When I raised the roof I measured how much roof sagged. There was nothing at all. So I can say reinforcement is strong enough.....
I inserted 1.25 square tubing inside each post and riveted them with steel rivets first. Then I welded extra steel. Here is what it looks like:
I didn't like rear door and all rear part at all. First it was all rusty and ugly, second it is flimsy and needed to be reinforced for new 8' roof. Because I want to have slideout that slides from back wall out I made new frame out of 2"x2" square tubing and welded it and riveted it instead of an old rear emergency door:
I extended new frame all the way down to rear bamper:
Here is view from side:
Also I added another steel angle here:
Now I like it. It is all very solid and built like tank.