UPDATE: Frank explained the sprayer on the side of the jeep: The sprayer in question is termed a back pump sprayer. The wildland Firefighters used this type of back pump on mop up of forest fires. The can could carry 5 gallons of water. Later came the rubber type back pump to mop up forest fires. The rigid pump was awkward when bending over spraying water and even when empty it was awkward. The rubber type back pump was like walking with 5 gallons of Jello on your back. When spraying, you used one of your fingers over the nozzle to disperse the water to cover more area. Short pieces of used cotton jacketed hose was often used on the shoulder straps on the rigid type pumps to relieve some of the “torment” to your shoulders. Both of these style pumps had nicknames that are not printable at this time.

If you are looking for a mid-1960s CJ-5, this might be a good value. It includes a 120volt mod and something on the side (water?).

https://www.facebook.com/marketplace/item/1424806751296521

“1965 CJ 5 runs great all original equipment 3speed manual transmission”