Might be too old to matter, but here is a shot of our newly installed e-track on the floor. We added 5/8" ply to make it flush with the floor:

 

Robert,
Nice photo, reps sent.
Did you use the wall e-track on the walls or is that the same as the base?
I think the wall track is smaller if my memory serves me.

 

The wall and base etrack are the same. I've only seen "E Track" come in 5" wide rails (with 2" openings). I have seen it come in vertical and horizontal configurations. The photo of the trailer may look like different sizes, but we overlapped the 5/8" plywood over the bolt holes on the track (to keep the floor as flat as possible without 'dips' along the edges of the rails).

 

You have quite a set up with so many different options. What are you hauling?

 

...you name it, it's probably in there.

The front of the rig is for our administrative equipment, radios (Yaesu 857d, Icom F3011/F11) and antenna cables, PPE (structural/USAR helmets, etc.).

The left side front is for backboards, cots, easy ups, the right side front is Pelican RALS lights and regular halogen lights.

Left side fore shelf is all medical - c-collars, triage kits, medical trauma bags and gear for about 150-200 moderately injured patients. Left side aft is water PPE (PFD's, helmets, throw bags), sand bags, tools and more structural/USAR helmets.

Right side fore of the axles holds cribbing, cordless saws, extra med gear. Right side aft of the axles are breaching tools, misc gear, 5000w generator, pry bars.

In the front floor goes coolers and a 3000cfm Port-A-Cool unit, and some chain saws. Then centered over the axles is a rehab cart (7ft by maybe 2ft, 4.5ft tall) that holds a CB16 portable shelter, light kit, inverter generator, white boards, wireless printer/copier, rehab supplies (core cooler chairs, etc.).

Behind that goes a portable field desk and 35gal reserve tank for the Port-A-Cool unit.

The floor e-track holds the center gear down, and that gear needs to change with the seasons (we don't carry the Port-A-Cool units in winter, etc.), so the gear needs to shift fore and aft based on load, so the e-track lets us keep the tongue weight correct.

...on really bad wind events, we've been asked to carry boats (when it gets too windy to strap the inflatables to the tops of the fire engines), so that's another reason for the track - lets us keep the boat upright and off of the equipment racks when we need to follow them on calls.

I'd like to add some of the wiring to run the winch to get that rolling rack out easier (10ga wiring) and have it also tie in to let us run the radios while we set up generators and such.

 

Here is a shot of it with an earlier load configuration (before we got the rehab carts):

 

Very nice. I did see your other post with some exterior pictures too.
Looks like a great cause.
Good luck with these guys.