The simplest and usually cheaper option is to hire a show truck. Depending on the availability of the info vehicle, a campaign can begin at super short notice. How long you plan your roadshow for, depends entirely on your specifications.
Tax advantages, balance sheet neutrality, cost calculation neutrality, liquidity and planning certainty are the first arguments in favour of leasing a promotional truck. If you want to keep the costs of a show truck within manageable limits, leasing is the perfect solution.
If your roadshow is going to be a long-term one, then you should think about buying an info truck. The great advantage of buying a promotional vehicle is the freedom you get to customise your event truck. Custom-made is the key word here.