I have no experience with trailers so take this for what it's worth.

I have a very nice router table that allows me to do all kinds of stuff. My idea could work with a regular router using and edge guide or a straightedge clamped in place.

Basically I want the floor on my future trailer to be T-track. That way i'm not stuck with predetermined mounting points and I can make whatever custom mounts I need. They can slide wherever needed. If I wanted to spend a lot of money I could use knobs to tighten things to the track or go cheap and use nuts and bolts tightened with a socket wrench or whatever.

Since routing directly in the wood will weaken it and cause it to bow I'd probably use 3/4" MDF that in turn is glued to a piece of 3/4 ply. The MDF would have the routed tracks in it. Of course a more expensive way would be to use aluminum T-track screwed in place but considering how many tracks I want that would be really expensive.

If you have something really heavy just have more mounting points for it. Then use bungees or velcro straps or whatever to hold things to the mounting blocks.