I know this might sound odd since your MH has a built in genny but I am going to buy a Honda Companion 2000i http://www.hondapowerequipment.com/products/modeldetail.aspx?page=modeldetail§ion=P2GG&modelname=EU2000i%20Companion&modelid=EU2000IKN1
I know buying a $1200 generator seems like a lot considering all the gas you need to burn to get your money back but I am justifying it because I dont have a back up home generator yet and I intend to use this at my house as well.
This unit is really nice because it has a 30amp plug in it that you can connect right to your MH. Just make sure you use this wisely because they are high theft Items. I plan to chain it to a tree a good distance from my rig when I camp places that dont have shore power. Living in GA you need to have your air conditioner on because of high humidity.
Here is the specs.
* 2000 watts (16.7 A) of Honda Inverter 120V AC Power
* Built in 30A outlet for easy parallel capability with another EU2000i
* Super quiet - 53 to 59 dB(A)
* Lightweight (less than 47 lbs.)
* Eco-Throttle - runs up to 9.6 hr on 1.1 gal. of fuel
* Advanced inverter technology provides reliable power to computers and other sensitive equipment
* Parallel with another EU2000i for additional power
* Protected by Oil Alert®
* Power for microwave, refrigerators, hair dryer, and small AC units
* USDA-qualifed spark arrestor/muffler
* 3 year residential and commercial warranty
Click link for more information
EU2000i Companion Specifications
Engine Honda GX100
AC Output 120V 2000W max. (16.7A) 1600W rated (13.3A)
Receptacles 30A 125V Locking Plug, 20A 125 V receptacle
DC Output NA
Starting System Recoil
Fuel Tank Capacity 1.1 gal.
Run Time per Tankful 4hrs. @ rated load, 9.6 hrs. @ 1/4 load
Dimensions (L x W x H) 20.1" x 11.4" x 16.7"
Noise Level 59 dB @ rated load 53dB @ 1/4 load
Dry Weight 45.9 lbs.
Residential Warranty 3 Years
Commercial Warranty 3 Years
I used a Kill-a-watt meter off a heavy duty extension cord to figure out what each thing in my MH pulls for power. My AC unit pulls 1200 watts on high under full load with a jump to 1400 watts when it cycles on. This little Honda should run 5 or six hours on a gallon of gas. To me this justifys the cost of the generator. I also will use my MH generator at rest stops and times when i pull over for lunch. I just like the piece of mind knowing that I dont always have to run up my 7000 watt onan.
Good luck and tell us how it turns out.