Hi Billozz,
When you order one of our DIY systems, you will find that we do include a section on tank fitting. However this is only intended to provide an idea of how to mount the tank as this is VERY vehicle dependant.
If your vehicle has ready fitted load hoops or mounting points these can be used with correctly rated ratchet straps. If not then suiatble mounting points can be welded/bolted to the vehicle floorpan and then the tank mounted to these with suitably rated ratchet straps.
The easiest way is to take the tank to your local garage and get their recommendation and perhaps get them to weld up/bolt in a suitable mounting point or even a simple frame, the tanks have a recess around them to facilitate this.
As you can see no one 'mounting kit' would be suitable for all vehicles and requirements.
Any vehicle specific queries give us a ring and ask for Alex
Alex Gardiner