I also lightly sanded the front portion of the trailer box, primered it, and painted it white. I rolled the trailer outside for some good ole' sunshine to dry the paint there and on the tongue area. Things were shaping up.
There is still some rust that I wasn't able to attack at the base of the tub/front frame interface, but I gave it good chip/sand/pick effort, and doused it in primer and gloss black paint to hopefully abate the oxidation.
@Borrego60 , I also plan on a future separation of the tub/frame to attack this and some other areas as a hopeful total eradication of the rusty stuff.
But I wanted to get some use of the trailer, so the attack continued at the surface.
The steel nose box had dried after several coats of primer and white gloss, both inside and out. Once dry, I used the new stainless fasteners and bolted it up to the freshly painted tabs/front frame area of the Chaser.
Then the wiring commenced. I bought a new Blue Sea 6 position fuse block, and spent a few hours of quality time re-wiring the battery, fuse block, inverter, and 12V plugs so I could sleep at night. The extra effort paid off, and now things are squared away with efficiency and safety in mind.