Quoting Bob K
David, its not a bad piece. If I may, if you are trying to make a Mack R truck, then you will need to move the front wheels under the engine and not the cab. I believe this is the look you are trying to achieve:
http://www.fdnytrucks.com/files/html/otherstates/Bergen%20County/Carlstadt.htm
I don't know if you are trying to mimic the FDNY, but the color scheme is off. Current FDNY trucks are white over red. I agree with Sven and say make it a different department, this way you can make up your own color scheme.
I would also add a dump tank to your tanker (or at least the appearance of one), Do all of this and you'd be in pretty good shape.
Thank you for that realy, realy good comment and thanks for your time for writing this, i will take all of this advise on board and upload my new version of it and maybe create my own fire department with my own colour scheme, thanks again - David :)