@Eric6248 With that number of beds, you will be doing two loads (not to mention the towels) anyway. If you are shoving the linens for all of the beds into one load, you are not cleaning properly (IMO). If you can fit a regular size washer and dryer, great! Purchase the units with the largest drum sizes that will still fit within the space available.
We have a property with two kings and one queen. One load for each bed includes top sheet, bottom sheet, pillow cases and duvet cover. Three loads for linens, two loads for 6-10 sets of towels (bath sheet, bath towel, hand towel, washcloth per set). Housekeeping is scheduled for 4.5 hours, and rarely does our housekeeper resort to the spare quick turnaround linen and towel sets. However, she is a whiz with her timings and worth her weight in gold.