axle and wheelwell question

[air66stream]

I had my 66 Overlander up on jack stands that were placed under the frame so the axles were hanging. I put the floor jack under each backing plate one at a time. I only had to raise each one about an inch before it began to lift the trailer. I assume this means the axle (spring) is in good shape? I then dropped the axles off to help me finish the frame. The brakes, drums and magnets are in good shape, but I intend to replace the brake springs and shocks. I have several questions.

A: Is there any thing else I need to look for on the axles?
B: I am using POR15 on the frame. Is this OK on the axles too, or is there something less expensive that will do the job?
C: The wheelwell has a bit of rust on the galvanized part. Should I POR15 the whole thing, or just the rusted spots.
D: Is the frame supposed to be black or silver in the wheelwell area?

Thanks in advance for your help, TomE