T@B 320 Generator and tongue weight

Just bought at 2019 320 with the Danby overhead A/C unit.  I do a lot of dry camping in hot weather with dogs so running the A/C on generator is important.  What is the smallest generator I can buy?  I would like to mount this generator on my platform and am also concerned about tongue weight.  My Audi Q5 has a 440 lb hitch weight capacity.  While calculating tongue weight can you simply add the generator to the specified tongue weight?
So two questions:
1.  Generator size for a T@B 320
2.  How to measure tongue weight  
Thanks!

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