tow

For the exhaust, I would look at other alternatives, like adding a support that pulls the exhaust away from the problem area, or adding some silicone caulk on the spot to remove the metal-on-metal contact.

Some squeaking when starting may be the WDH, or the ball.

Check your owner's manual, it may state one maximum w/o a WDH and another with a WDH.  You want to keep the pod's tongue weight at 10-15% of the total weight of the pod for proper handling, so don't unload it too much.

Normal when towing, but if a WDH is set up correctly the ride quality should be comfortable because the front axle will be close to its normal height and the rear axle will be within an inch or two.  Plus the WDH adds an extra suspension system to the whole rig with its spring bars.

 

Your specs have just enough power and torque, minimum.  6 speed tranny is good, it will be geared lower on 1st and 2nd gear than a 4-speed to get off the line easier while towing.  Average sized brakes for that towing limit. 

 

The biggest limitation is the wheel base, 105 inches is short for towing.  Which means a sway bar or WDH with sway control is a must.  NOT just the "sway control" built into the vehicle, that is secondary to real sway control.  That just selectively applies the brakes to dampen sway after it has started, causing excessive brake wear and heating.   See the link in my signature for more info on controlling sway - a short wheel base is one of the biggest contributors to starting sway.