First let me extend you a hale and hearty welcome to the forum.
I presume you have a 140 WB if you have a 2004, but if it has OEM L-track on the floor that is an NCV3 feature so 144 would be correct.
If you use the blue bar above to advance search in the RV and Conversion Write-ups I believe that you will find some helpful pictures. I think that
Graphic Dave D_Bertko has installed it all over.
If you use enough sheet metal screws I personally believe that it is a great way to fasten the L-track. One of the nice design features of L-track is that because it is so rigid it transfers load to other fasteners and reduces point loading. Another feature is that it will not fail catastrophically like a single point load ring can. The failure mode will be more to pop some fasteners and distort the track, not pull the track off completely.
Others might prefer rivet nut style fasteners. They are fine too, but more expensive and more work to install properly.
Here's a couple pictures I saved for reference. The first picture has some L-track installed.
Good luck. vic
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Mounting L-Tracks to walls, over liner, below windows in '04 144'' High Roof
I have a 144'' high roof passenger van. I have two L-tracks on the floor. What I want to do is add L-tracks underneath the windows, on top of the liner, and possibly the ceilings as well.
I found a couple helpful threads but couldn't find the right information regarding the positions of the metal behind the liner, where its best secure drill into...also are sheet metal screws the best way to go?
Please advise!