Originally Posted by jefferson
I am wondering the same thing. i have a 2009 Ford F150 Supercrew 4x4XLT 4.6V8 with an aftermarket hitch. The sticker on the shows Towing Capacity 6000lbs/ Hitch Capacity 600lbs and Weight Distribution 11000lbs/ Hitch Capacity 1100lbs.
My trailer is about 6500lbs if it loaded to the max.
A couple things to consider - whether its your trailer or the OP's Shamrock 19, they have a similar frontal area and the same square profile. This will create a lot of drag. Towing a square front trailer "feels heavy." Much different than a popup or even a boat.
And with your trailer weight and truck specs you need to look at payload. That is usually the limiting factor for half ton trucks. Manufacturers put big tow ratings on these trucks and rv salesmen use those to sell people way too much trailer if they can a buck, but in reality, most half tons and full size suv's are over the rated payload from tongue weight, people, and gear long before the max tow rating is exceeded.
Our 23IKSS has a max GVWR of 6500. Weighed it loaded and it was 6200. Tongue weight was 800lbs, and that put my 5.4L F-150 w/ factory tow package within 50lbs of max GVWR. Every setup is different, but that's what we came up with.
Now, how well your actual combination tows and where/how far you tow and what your comfort level are will all affect your final decision. Until you actually try it, its hard to know for sure. And, keep in mind, towing adds wear and tear to the truck. Things like a transmission oil cooler that you get in factory tow package help with that.