I think your fine, sure it could be better but there's nothing dangerous there.
Remember that a lot of the limits put on by manufacturers are for warranty purposes so even IF you were a little over it isn't that big of deal. It's not like there's a line in the sand where disaster looms on the other side.
Don't worry and have fun.
Funny how people would go bananas if I even approach the limits towing with my minivan (which has more payload btw) but with a half-ton that is 1000lb over weight the response is so different.
OP is way over weight with this combo. IMO you really need more truck or less trailer/cargo, there really isn't an easy way around this. This is an accident waiting to happen.
Have to agree with the OP on this one, pretty much all the TT's out there are of such poor quality so as to be considered to be disposable. Luan, foam, staples, everything is as cheap as possible and the labor/build quality is horrific. There is a reason Berkshire Hathaway is doing well :)
I can't wait until they start mass producing these in China, we'll get a better product at a better price.
I used the chemicals/additives for a couple of seasons and honestly never noticed any difference at all. We settled on a short routine that works for us. After a camping stint...
-Dump as normal. Dump a couple gallons of water directly down the toilet at the end of draining the black tank and let that drain.
-Close everything up. No time wasted holding up everyone while 'rinsing' the black tank. Geez I hate waiting for that guy.
-Add one cup of borax down the toilet, wash another cup into the grey tank. Gallon or 2 of extra water into each tank and we're ready for the next trip. Driving allows the water/borax to wash around.
-If the black tank doesn't read empty when we leave for the next trip add a bucket of ice cubes on the drive out. If we're planning on an extended stay we'll dump on the way to get back the couple gallons of capacity.
That's it. Simple and quick.
We have a Forest River Shamrock 21ss and it's surprising how much heat it actually retains given the tent ends. We use the heated mattresses and I keep a 1500 watt electric heater handy if it gets too cold and we have powered site. Otherwise the furnace works fine :)