When I got my trailer the first thing I did was cut and lay 5/8 plywood covering the entire floor. If you want to sell or get rid of the trailer you remove the wood and there sits a virgin floor. I placed the stripers and driver where I wanted them and marked the floor, I cut 2x4s and made little U shaped tire captures that I attached to the plywood (up through the plywood with bolts, not screws, they need to be sturdy). Front and left striper tire left driver tire on the left side. Front and right tire on the right side for the other striper. That minimizes the trip hazard in the middle of the floor. Against the left wall a 2x4 10" out from the wall 10' long captures the stencil bottoms. They lean against the wall and are secured at the top. Also made captures for the paint buckets on right wall in front of striper #2 and across trailer in front of striper/driver parking spot. High up on right wall I have my 8' stencil letters (STOP & LW). High up on the left wall I have my stop bar frame, wheel stop L's and 4" line stencil for hard to reach areas.
In the front left corner I made a rack to hold my long handled tools up right and untangled. In the front center I built a full height shelf unit with shelf lips to keep things where they belong (attach to floor and wall). The floor and the first shelf each fit two plastic milk crates. and the upper shelves are closer for things like hammer drill, small stencils and lay out supplies. Next to that is my generator on the floor with a shelf above that and a multi drawer tool box above that. Right front corner has lay out weights (dead men). The door has hand cleaner dispenser, long spray can wands and lay out lines. on the wall to the left of the door is a shelf for tape measures and next to that hangs the reels of lay out line. If you PM me with your email I'll take some photos and you can call or email with any questions.
Ps after it was all organized I screwed the bottom plywood to the
trailer floor. Everyone is different but this is what worked for me.