Get a new hose (so you can deal with your own poop not someone elses)
I suggest a kit with 2 and an elbow. (elbow goes into the waste hole at dump site)
I like the clear hose part that connects at your dump port, and the hose plugs into it. Lets you know if the water is clearish, or an easy way to tell when the tanks are empty.
I have never really gotten the cleaner feature on the clear extension to work, however I have internal tank cleaners.
You should check the ELECTRIC part of the water heater (make sure it has water in it) for operation. Often the element gets burned out and its an 'oh crap' moment after you leave the lot when it doesnt work.
Make sure the awning opens and closes correctly. My first TT, the awning did not open. The dealer actually tried to charge me to fix it by adding the cost to the purchase order. I walked out and they changed their minds.
I like having a 30a to 120 plug adapter AND and 50a to 30a 'dog bone' I have been to a few campgrounds that the 30a is broken, or tripps at about 14 amps. The 50a usually always work.
Try not to haul with water in the fresh tank.. its a lot of weight you dont need while towing and 99.99% of camp grounds have a place to get fresh water.
WATER FILTER! Walmart has the twin pack of in line hose water filters with a bendable end for like $30.
STERELIZE the fresh water tank with bleach. Look up the directions online or on this site.
Your tank fill indicators rarely every show anything remotely correct. DO NOT rely on them. esp. for fresh water. The black tanks, you can shine a flashlight and see inside from the toilet (usually.)
NEVER run your AC off a 120 plug.
Buy Tank treatments. These are drop in packs or liquid that help decompose the toilet paper/poop and keep the smell down. You will regret not using these.
Also.. empty the black tanks first, then grey tanks, (cleans the hose)