Try renting long term. I did actually look at an electric van for my fishing, the range should be adequate. Over 2 years the total cost of the rent was a smidge under £8k, if you bought one new, you would lose more than that in depreciation. You need to be a business to rent, as opposed to lease, rent covers maintenance and road tax. You could rent different types of van for a week or so at a time, just to see how you get on with them