Thanks, everyone.
You guys should like this story;
I took the prevailing advice and bought a brand-new 'Rhino' sewer hose with new fittings. It was really cheap at Wally World, so, why not?
I was getting ready to hook up my new sewer hose system, when I un-capped the low point drain.....and got hit with a solid steam of month old raw black tank sewage!!!!! RAHHHH!!!!!!
I put the cap back on real fast, which reminds me of an old joke, but later. I only got slimed on my hands and shoes.
I KNOW that I closed that black tank dump valve last trip. I had to of! It must have either been knocked open by road debris, or opened by someone with a perverse sense of humor. What a mess. luckily, I was at a place that had paved sites, and lots of water pressure to wash it all away.
Suffice to say, I have a new entry on my set-up check list.
I feel I'm a fully initiated RV'er now!