Tips for dumping the tanks: Go to a medical supply store or even the pharmacy section of Walmart and buy a box of latex gloves in your size. Also buy a bottle of hand soap. I use the Fast Orange hand cleaner. Place both in your holding tank compartment. When it comes time to dump the tank your gloves are right there and you have the soap and a water supply and can wash up there.
Other tips:
1. Make sure both grey and black valves are completely closed before removing the cap from the drain. Also make sure they never get opened while the cap is on as there will be about a half gallon of waste just waiting for you when you take that cap off.
2. When you put the drain hose on, make sure the bayonet latches fully engage. Also make sure the other end of the drain hose is fully in the receptacle and can't pop out. When you pull that black valve open a lot of waste is going to dump into that hose all at once with a lot of weight and the last thing you want is that hose coming off from either end. This is where most rooky dumpers seem to have their biggest failures and make a huge mess.
3. Dump the black tank first. Once it's empty pull the grey tank valve. This will help wash any remaining solids out of the hose.