Another Chinese knock off.... Is this the one?  http://www.gensetsources.com/powermax-generators/4400-watt-gas-powered-portable-generator.htm  I see it is rated at 69db. That's not very quiet, I would guess your 6500 is a little louder. It would be OK as long as you are a long way from anyone else.... Like maybe one mile away. The Honda and Yamaha inverter generators are rated at around 58db at full load. For every two decibles the sound value doubles. 60db is twice as loud as 58db, 62db is twice as loud as 60db, etc. etc.  Save your money and get a EF3000iseb Yamaha or a EU3000iSA Honda, you and your camping friends will be glad you did.

Folks on Amazon.com  rate them highly!!  http://www.amazon.com/s?ie=UTF8&search-alias=tools&field-brandtextbin=PowerMax

HTB... Is that P4300 set up to burn Gasoline or LP at the flip of a switch? You hauling it on the truck bed or in a trailer compartment? Always thought it would be neat to house a generator in a under body tool box on a flat bed like yours..... Generator is out of the weather, you're able to lock it down, it's out of the way and it's with the truck no matter what trailer your pulling.

retento, installed a generator under a truck bed on one of our site trucks a few years back.  It was a little bit of a pain after a while.  Fueling was the biggest problem and the employees started complaining about it so much that we turned the box it was in back into a storage lock box and just loaded the generator in the back of the truck.  What works/worked better is a flat bed with 8' storage boxes down each side of the bed with the a/comp on top of one and the generator on top of the other one.  That's a much better setup.

deranger

Go for that Powermax then, and let us know how it does. You'll love the fact that you won't have to yank that cord to get it started. I had to use the "rip cord" on my Arctic Cat 4 wheeler a while back.... Found out that I was running out of arms and breath real fast!!! Pull the cord, hold throttle and hold the compression release all at ther same time!!!

You can also find a muffler for the generator.  I don't remember the wabsite off hand, but you could probally google it.

Here's one website 

 http://www.jackssmallengines.com/quietmuf_index.html

The less expensive generators often only have a small inefficient muffler. It's one way they sell for less money. Depending on the make and model of your generator, it's possible to fit a muffler from various  garden tractors. They are usually designed for larger HP motors and will reduce the exhaust noise, without creating a great deal of back pressure.

The mufflers for the multiple cylinder, water cooled, gas and diesel engines, work very well. Some of the smaller aftermarket mufflers for imported automobiles are also available. Most auto parts and muffler stores carry a wide variety of generics, and they can be purchased by size and shape.

A muffler shop can also create a different exhaust pipe shape to redirect the exhaust gasses. This can be important if you plan on a permanent installation, or want to run the generator within your trailer.

Gard