I had Soleus portable 14K BTU two hose in my house w/ central air to cool a hot 250 sq. foot bedroom. I eventually replaced it with a Fugitsu split system of 12K BTU.
I would estimate the Soleus was about the functional equivalent of 7,000 BTU. It ran continuously to do the same work as the Fujitsu just idling along with quite a bit of compressor off time. The Soleus successfully discharged condensate into the exhaust hose and I never had to dump the pan running AC alone. I did have to dump condensate pan running heat pump. The two hose Soleus used 6 inch diameter hoses and that alone took up quite a bit of space. Noise along the lines of typical RV AC on medium or high fan.
Personally I'd suggest looking into a way you could adapt a 5K BTU window unit into the back of the RV. It would be much smaller and lighter. It would draw much less power and be more efficient. I'm not sure running the generator near 100% load long term would be good for it. Or somehow as suggested, swap a 15K BTU roof air unit, blow a fan to back, cordon off the front cab area, and put reflectex on the outside of some of the sun facing windows.
