Question about determining the proper ball mount height for towing
So I have a popup camper with a hitch height (measured off of the bottom of the tongue coupling with it being pretty level) of 17 1/2" (camper weighs in around 2800 lbs, btw). The top of the hitch receiver on the new Transit is 13 1/2" without any weight in it at all. When we go places with it, it will have 10 folks, weighing in around 1000 lbs or so (for now, but the kids are going to grow), plus another couple hundred pounds of stuff (food, clothing, etc.). I am assuming it will squat it down just a touch, but not a lot at this point.
So, a 4" rise ball mount would get it pretty darn close to level, but I definitely don't want it to be nose-up on the camper hitch to keep it from swaying. If I'm off just a bit on the measurements due to the concrete being weird where I parked the camper, that could throw it off just enough to be nose up slightly.
Therefore, a 3" rise ball mount might be in order, but that's going to definitely put it in a nose-down attitude. I see a lot of 2 1/2-3" rise mounts, several 4" rise mounts, but nothing in the 3 1/2" range, so I'm going to have to make a choice. With any weight in the van, though, it might look a bit like \ / going down the road.
The other thing I don't want to have happen is the camper causing the rear of the van to start "porpoising" up and down over bumps, which would likely make everybody in the rear of the van sick. The camper has a C frame for the tongue, and from what I've read, that makes it a bit more difficult to put any sort of WDH on it due to clamping issues. So, I'll just have to get the hitch height right to hopefully knock the porpoising down as best I can.
So, do you guys have any suggestions for me on this? I don't really want to drop another $150+ on an adjustable mount since this is likely the only thing I'm going to be towing with the van for a while, and most of them are in 1" or more adjustments anyway, so to me it makes sense to pick a mount and go with it.
Thanks for the help.
2016 T350, mid roof, 3.5 ecoboost