Thanks Old Tech Guy. Very interesting information and Fleets of over 1000 are seriously large fleets. Over 30 on one site would be considered large in the UK. Is that 85 to 185 dollars/ truck per annum or per month? If per annum that sounds realy cheap if your supplying the service described and completing regular site visits etc. This would mean 1000 trucks are only going to give you 18500 dollars income per annum which wouldnt cover one mans annual wage. This is something I was considering if there was a Market for in the UK to do on a self employed basis but starting off would have to be on a % of savings, hourly rate or fixed cost per project. Would take years to get the size of your companies business. Thanks again for the information though.