buying used truck but question on blower

ok im about to go check out a used truck and probably going to buy it if all my inspections check out but for the life of me i cant identify the blower system on here.
can any one help me out? ill be using the truck to blow 40/70 30/50 and 100 mesh so if any one knows or has experiance with this style of system id like the info... and yes i know a GD12 is the norm but im just starting out

 

yeah after i posted this thread i dug a little further into google images and i found it and it is indeed a roper pump... so needless to say either i spend $5,000 swapping it for a hot air blower or i look for a cheaper truck that will work out and has a pto and have the correct blower instaled

 

ill be leasing on to a company out of texas and depending on how hard it is to find a trailer to buy ill be renting on of theirs or from a rental company out of PA where ill be running most of the time, and yeah i know a 9 will work also but ive gotten use to the 12 that im using on the truck i have now as a company driver, but im starting out with a bank loan so im trying to devide that up the right way so i was hoping to find an ok used truck with a blower on it without spending 10k on having a pto and blower instaled into a truck without it... still thinking that i may get that truck and have them swap blowers on it and if the sand buisness every drops out in my area then i could run bulk liquid since ill already have the pump to swap out with.... that could get pricey tho so im not sure what my best route would be untill i get my options narrowed down more and get a decent quote for a pto and blower instal