I've been driving F-350's for 12 years. Personally, I don't think there is enough of a ride difference to worry about it. Our current 5'er is just over 8,000 dry, our new one is considered "light weight" and will be around the same dry weight.
I'm not worried about it one bit. I like having more than enough truck! Same goes for the diesel engine with way more than enough power! I can't see that it would affect the trailer at all. Mine isn't harsh with the fifth wheel hooked up. I think today's longer springs take some of the harshness out of them.
Glad to hear you weren't hurt! Must have been scary!
