Thanks Adrian,
If the propane and the tunes can't be run at the same then i see no real point??? I am not overly concerned with the fuel economy part (hence the truck purchase) just expect it to be reasonable. I like the BBQ idea might have to look when I put the water tank in to see if there is some room for a 9kg gas bottle???

I will see how the 4" goes WRT the heat.
I can't wait to get home all the parts should be landed and I can hit the go button. I am all wound up after catching up on all the TRUCK **** online!!!!!

Oh and a big thumbs up to Clay from RiffRaff diesel. awsome source of information and down the line not just trying to sell you stuff you don't really need or won't fit your needs just right!!! You just don't see that very often more, so i will definately be supporting his products on my truck!!!!