I'm also looking at a Superglide and not because of a short box. I have a Dodge with an 8 foot box but have a tough time disconnecting the king pin from the receiver if the truck is not level with the 5er. So even if the 5er is completely level and the truck is a little slanted from side to side, I have a problem. I have a DSP hitch out of Edmonton and find that it doesn't take much to have the king pin jammed. Does a superglide give you some leeway?