Trailer deck preference: wood or diamond plate?

I go 2x6 tongue and groove put horizontally not the length of the trailer.

All the used motor oil gets brushed on the wood to help preserve it

Steel decks can be slippery when wet and rust out. Some vehicles have a narrower wheelbase so the "drive overs" are a useless point.
C channel frame so the tubes don't rust out. You could technically undercoat it.

Take the A frame jacks and throw them away unless you don't like your tailgates.

Ramp storage is the other annoying thing. Best trailer I had, the ramps were slid into the beaver tail with a door that closed. They were not hanging low catching curbs or have to walk a mile to slide them into something else.
Other issues are light weight axles that are just strong enough to hold two extra lbs. Any more weight and they bend.
That is just my .02 and I have never seen another trailer like I described. Guess I am building my own next time