'Tool man'

If John used a laptop it would help him out considerably. As he would be able to keep a diary on his laptop, he could use it to listen to music while or while not working. There is also a calculator allowing him to do all his adding up without carrying around an extra calculator. He could also create a spreassheet to hold the price list from his catalogue. Also, if he had the internet on his laptop, he would then be able to use a map online whenever he got lost instead of carrying around a map and he could also create a website and this would enable to advertise his company better and also he could communicate with his clients via e-mai, also it would be beneficial to John to have a mobile phone, as he could keep all his contact numbers and addresses on there and he always has it in case of an emergency and also it enables him to contact clients. Also, if John has GPS it would enable him to find his way to his clients quicker and easier and therefore he would have no need for the map anymore.
Although, there some disadvantages to this, John would find it hard to learn how to use all the different programs on the laptop and how to work a mobile phone and GPS and also it isn't always really sometimes the mobile phone and laptop may run out of power this then becomes a problem for John as he doesn't have his necessary information.
However, I think overall it would be very useful for John to have this equipment, although i think he shouldnt just rely on them but it would condense the amount he carries around everyday.