LCI's denial of warranty for using a gooseneck adapter to reach down to the truck bed may be based on what happened to this individuals 5th wheel:
https://www.thedieselgarage.com/thre...-say-no.70978/
LCI is hypocritical to warranty Reese Goosebox, which is exactly what they're denying - a modification of the pin box. Andersen & Pullrite adapters are smaller and put the connection much closer to the kingpin than Reese's. Maybe $ from Reese is a factor?