I use water proof grease for no other reason then thats what I have always used.
I know a few that use the red high heat like mentioned above.
Not all grease mix with each other!! So start with one and stay with it.
I have painted a trailer before and it lasted pretty good, but you are always going to have to stay on it!
As for the bearings, get your self one of theses!! I redo mine every year!! I clean well to get all grease out then repack in seconds!~
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What do you have for springs?? eye to eye or slippers?? I have a brand new set for a 4000# trailer here, the good thing about them is they are Mono, meaning it is one leaf! No more squeaking rusty noisy springs!!
I bought 7 years ago for my single axle and they worked great!! But the co. messed up and sent me two pairs instead of two springs!
But they were eye to eye and I wanted slippers, so wht I had a friend do, is heat up the eye, and bend it stright out, now I had a slipper and it was great for 4 years till i sold the trailer.
There yours for the price of shipping. If you needs eye to eye I will have to measure how long they are.