We have an EU2200i Companion unit and a 15K A/C fitted with the Micro-Air Easy Start. The single 2200i starts and runs the Micro-Aired 15K A/C fine, albeit at a high RPM. But, the 2200i puts out 1800 watts versus the 1600 watts of the 2000i.
After a week of dry camping in high 80s/low 90s, we have decided that a second, paralleled 2200i may be in order. Hopefully, this will actually lower generator RPM and be more quiet than a single 2200i at high RPM. In the spring and fall (when A/C is not needed) we will bring just the single 2200i Companion unit.
Considering that you have a 13.5 A/C, if you acquired a second paralleled 2000i unit, it may comfortably run the A/C without installing an easy-start. Finding another 2000i would be your challenge. Also note that, while the 2200i can be paralleled with some 2000i units, it depends on the serial number of the 2000i. Look on page 35 of the 2200i Manual