Take this to the Montana forum. You'll find someone there with your rig and TV who can tell you what's what. If mine weighs in right for my truck, and it does, I can't imagine yours doesn't work with your truck. First opportunity you have get the whole thing weighed by folks who are used to weighing RV's.
Dick and Joyce
2010 Montana 3665RE
Dodge 2500HD Maxi Cab Laramie Edition
Diego, Norm, & Bitsy
I have a 2011 3455 and do not fulltime, but have a full load of goodies in the 5er storage bay. Here are my weights (which I have to believe for the 5er will be similar to yours). Hooked up my total rig (5er+tv, ready to camp) weighs 22,200lbs. My tv by itself weighs 8500lbs. So the 5er weighs 13,700lbs (22,200-8500). Hooked up, my tv (rear+front axles) weighs 11,020lbs; therefore my pin weight is 11,020-8500=2520lbs. If your tv weight alone + 2520lbs exceeds your tv GVWR or the distribution of 2520lbs on your tv rear or front axle exceeds their weight ratings, you have too much 5er for your tv. I'm good with a 2008 F350 SRW 6.4l diesel, I fear you will find the specs on your tv are exceeded.
. I have seen RV wrecks due to inadequate tow vehicles where family members have been killed and/or maimed and the owner paid heavy fines and sat in prison for felony vehicular manslaughter/injury/homicide because he had an inadequate TV for the RV. The tow vehicle you tow your RV with is your responsibility.
PLEASE post a link to a story about this. I hear this all the time, but have yet to see an actual case presented to me. All I hear is hearsay, not an actual story.