I've made a living towing with long bed and short bed LDTs. My experience has been bed length had zero to do with my trucks ride quality nor did all my longer longer wheel base trucks ride easier than my other shorter wheel base trucks.
I have both....... and use both pulling my 5th wheel RV and various other flatdeck trailers.
I can give several reasons for using a short bed and the same amount of reasons for the long bed. In the end they both have their advantages and disadvantages but mainly its what we like to use.
Whats so silly is some of the clueless remarks trying to convince others to use the same ........... they do.
IMO the biggest issues is choosing a red one ......or maybe the blue one but lordy is that black one bee-u-ti-full.
The OP made his choice now he can become a xxbed length fan.