Ok, i have made these changes for you. I will give you my opinion if anyone else wishes to add the no worries.
1) I think this version looks neater on the van, but the bigger diagnal version i think will look pretty good when on the van, i think it can be hard to visulise until its on there, but i have seen this kind of thing done before and it does look good and it will get noticed a lot more. the cost will be a lot more to print and fit but i think it would be worth it, this second version looks neat and tidy and you could probably get the vynils printed for around £50 if you fit them yourself which is easy.
2) i think your uniforms should be consistent with your van, it looks smarter than having a total different look, i have attached a simple piccy of a white t-shirt with the details on it.
let me know your thoughts