I have an 11 plate berlingo , I have found out that a good garage is the key so my success'!! the toolox and soldering box stays in the van , a Stanley organiser with a mix of fitting, a screw box , some clips . step ladder, pipe bender and 240v sds and impact driver and henry . I take everything else out when I don't need them and keep in garage, waste fitings etc, I try to do small jobs only and as I have a full time job and a company van I only use it in the evenings and weekends. so I organise my work good, and take everything I need only , I find I have saved a lot on fuel getting 46.8mpg out of it on rural roads mainly. don't know if it would work if self employed. probably would if you got use to it , + you find out if you have not got something BEFORE you get to the job!! I keep a fluidmaster cistern fill valve and flush valve at home for an example, I got called out to a job last weekend, push button broke, I told them quickest and simplest option is to replace the whole valve, the valves are £12 at screwfix, I got £75 for doing job and had everything on the van and did job there and then!!