I thought I would start a new Thread so that we were not hijacking someone else's thread. You mentioned the flammable markers as being too small and no one needs that much. I think there might be some confusion or maybe not. But to be sure, here are some picture of what i was suggesting.
My idea was for both the little red diamonds and the words flammable


This one would be more difficult to pull off. I guess you could do it in black and green like in the picture and the person applying it would have to plan well on how they painted to make it work.

This is the one for HEMMTT and then you could include them with the FMTV Fueler.

I thought I saw some HEMMT and FMTV trucks with Potable Water markings on the side, but I hve not found them yet.
Again, you may be right and people do not have enough vehicles to want to buy a hole sheet. In my case, my collection of US vehicles is only 500+ strong and I have 4 Fueler HEMMTTs and 5 Fueler FMTVs. I plan to buy more, but not a 100 vehicles. I looked around a little more and could not really find any other truck markings that could sweeten the deal.
Hoth