Trailer deck preference: wood or diamond plate?

Mine is diamond plate. If you change it, it may be best to take it off so the wood doesn't eventually rot out from under the steel that you weld over the top and then let the steel sag between bracing.
Thanks, the more I think about it, it doesn't really make any sense to put steel on top of the wood. I was looking under the deck and there's C channel about every 10 inches crosswise that I could weld it to.
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
Horizontal isn't a practical option since the C channel runs horizontally. I'd have to add longitudinal supports to attach the wood. I agree on the used motor oil, I roll it on with a paint roller. Takes longer to find the paint roller than it does to roll it on.

What kind of jack do you use instead of an A-frame jack?