Is there a figure used for "acceptable" pin box flex? Doesn't seem like with the amounts of weight involved there could be zero flex. Anyone know of a tolerance figure (e.g. 3/8, 1/2 etc.)?
On my Cameo I really don't notice any. I have a Mor Ride pin box. I know the rubber in the box flexes some but not much when hooking up. I've had problem with too much flex with a Lippert frame, and had to have repairs.