Cleaning of m/h condenser A coil

As owners of 17 units, in preparation for the upcoming a/c season we inquired about cleaning and servicing the various units. We were told that “the “A” coil must be removed to properly clean and service these units”. Is this correct??? If so, is $125.00 ea. a reasonable price??? These units are all single wide and average about 1270 sq. ft. We were also told these units require a 3.5 ton a/c??? Is that correct?? I should mention these mobile homes are in east Texas. Roughly three hours north of Houston