So, we are in the process of buying a 2007 Fleetwood Highlander Niagara like this one. We don't yet have a tow vehicle but have been looking around. We've been aiming for at least 5000 lbs of tow capacity, and came across a 2007 Mercedes-Benz M-Class ML 320 CDI with 4MATIC. According to the Camping World calculator this should be able to tow 5000 lbs. I checked on how much to get the hitch installed at Uhaul and it mentioned that the hitch it would use would be a Class 3 with Max weight: 3,500 lbs., Max distribution weight: 4,000 lbs. Given that the gross weight of this trailer is 3970 lbs, will this be an issue? This is our first popup and we haven't bough the tow vehicle yet, but just want to make sure we choose wisely.