Not to be the tow police, but I do not see that as a valid excuse when talking to your insurance company if you get into a wreck.
Storytime:
I had just sold my diesel Excursion and thought I could make do with the 100 to get trucks. I towed with mine twice to pick up 2 cruisers on my car hauler. I was about max at 6000-6500. I HATED it. Terrible mileage, butt sagged, and I didn't go over 65 as it felt too unsafe. The issue is the wheelbase is too short to be an adequate TV. This was on flat ground in Texas, no hills. When you tow an travel trailer, you increase the front drag, so it can get pushed around more.
I would give a safety margin of 20% at least when towing an RV. The 100s have a 6500lb rating, so your wet (fully loaded but not exceeding GVWR) weight would be no more than 6500-1300 = 5200. Personally that is too much IMO to tow, I would not want it to be more than 4300 lbs. 5200 lbs is about the weight of the 100 and simple physics says the large item will win.
I have mentioned this before but will do again. Here is a
99 that I picked up that was rolled. It had a 24 foot camper that was improperly loaded, too much tongue weight. He knew how to tow and had all the goodies- brake controller, weight distributing hitch and a beefy ball on the hitch, see the pics of it. The “tail wagged the dog” as they say, so even though he had everything he could put on the 100, it wasn’t enough. Flipped the truck on it's side after jackknifing around. His weight was about 6500-7000. Flat ground in East Texas too. Just look how mangled that hitch is.
My point is, be safe, your life, your family's and that of others on the road are at stake. Oh, I do have a big diesel again as my TV.
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