Tips and Advice on Boxing a Frame...

[IRON MAIDEN]

Not that it matters, but I'm working on a 46' International Harvester K3 truck. Very long frame as it is the 1 Ton model with a long bed. I am about to box the very back of the frame and install new springs hangers and shackle mounts. Then I will get ready to put in motor and transmission mounts. I will use the universal crossmember style to help strengthen up the front of the frame. I'm keeping the straight axle front end so I'm not boxing the front.
My question is about making the frame level and square before boxing it.
looking for tips and advice.
Original crossmembers are still in place other than the transmission crossmember. Do I just make sure the frame rails are level across from each other as in a level sitting on each rail? Front and back?

 

[dmw56]

No need to box a TRUCK frame!

 

[Bonehead]

I am with dmw56, Unless you are going to drop it on airbags.

 

[IRON MAIDEN]

I'm getting the same advice from other forums. I will just box the back of each frame rail so I have a flat surface to mount a bumper to.