Shaun
As a rule of thumb, a customer or prospect wants a clean carpet. Most, but certainly not all, don't care about your tools or how big they are, whether they are controlled by a micro processor or by a steam generator with radial foo-foo valves.
I do get the occasions though where previous cleans by, for example, a national franchise didn't meet their expectations, so a brief description of the relevant systems (not tools).
IMO, to bring a truck mount into your marketing material is probably best served by references to the considerable capital investment into your business with the highest powered equipment available, which will enable you to gently clean a delicate oriental rug through to the heaviest soiled restaurant, pub or nightclub.
Just the thoughts of someone inexperienced in the world of direct marketing.
Safe and happy cleaning

The Ken