Propane vs CNG

I have my cash finally to start buying a truck to build out.  I am putting together all of my costs.  One thing I am trying to decide on is LP vs CNG.  LP tanks are WAAAYYYY cheaper than a CNG tank, but if I go with LP most likely I will end up having to convert all of the equipment to run on propane.  It looks like the costs will come near even between the two.   My question is:  Does anyone here have any experience using CNG on a food truck ?  Everyone's thoughts on the subject even if you don't have experience with it is also welcome.  The other thing I am thinking is that CNG would be nice if I can eventually convert the engine to run on CNG.  A company here in town is currently installing a CNG pump with 24 hour card access for self service so I know it will be available locally. 
 
Thanks in advance for your input.