2018 F150 3.5L 4X2 145"WB 5'5" bed 3.55 Axle Ratio Max Tow Package GVWR 6750 lbs.,GCWR is 15800 lbs., Payload 1786 lbs., and max loaded trailer weight is 10,700 lbs. Used my haul gauge on current rig and have 800 lbs tongue weight and 700 with WD hitch. Have been towing 30' TT with GVWR of 7495 lbs. with no issue. I did install a Roadmaster active suspension for increased stability. Would like to consider a 33' with GVWR of 10400 lbs. and dry tongue weight of 660. Concern is mostly length but obviously tongue weight as well. Don't anticipate much boondocking so don't think I would ever travel with full tanks and lots of gear so not sure if I would ever come close to new GVWR. Anyone consider making a similar move or has done it already that can offer advice?

 

10400 x .10= 1040lbs tongue weight + 100lbs for WD = 1140 possibly just on the hitch at 10%. 1140-1786=646lbs remaining on payload. if you throw on 13% of the trailer then you'll be over the truck's hitch weight carrying capacity @ 1352 lbs.
That's going to be tight tolerances on everything and possibly exceed the truck's capacity in various locations. I'd look for a lighter trailer as that one is going to be a bear to tow with your truck.

 

Here is a link to a recent thread regarding travel trailer length.

Travel Trailer Towing Maximum Length

 

When you start towing 8000 lbs it is time to start thinking about a 3/4 ton. When you get to 10,000 it is time to seriously consider a 3/4 ton. I don't care what the truck is rated for. The ratio of the weight of the trailer vs the weight of the tow vehicle should be considered. If the trailer is equal to or less than the weight of the tow vehicle things are pretty easy. If the trailer is somewhere around 1.25X the weight of the truck it isn't too bad, but I'd not want to pull more than about 1.5X the curb weight of the tow vehicle. My truck weighs 6000 lbs. That means 7500-9000 lbs is as much as I'd want behind me regardless of what it is rated for.

 

My last truck was a diesel 2500. My TT is 40ft and "dry weight" of just under 10k. When I brought it home from dealer I had to go slow because the wind and semis blew the trailer around way to much. I could not keep it straight on the interstate. It wasn't to heavy, it was to long and the wind pushed it around. My truck was 7500lbs. I am an experienced driver with a Class A CDL.
Its on a permanent site so it never gets moved.

IDK what the max length is for the F150, but length certainly does matter right along with weight.

 

Anything up to 85 feet long is easily towable with a half ton. Stay around 32,000 pounds and your fine.

 

Take your wheelbase into consideration too. A longer wheelbase will be more stable.

 

 

53 feet is the Minnesota limit whether it be a single trailer or 5er/utility/boat combo.

 

Could you clarify how you define truck weight, please. Would it be the weight before fuel, passengers and cargo? GVWR? Also, is there a source for this safety recommendation?

My 2018 F150 3.5L Ecoboost with 3.55 rear axle ratio of 3.55, 145" wheel base, max tow package with 18 inch wheels has a GCWR of 18,100. Truck GVWR is 7,000. Payload after you add a full tank of fuel and one passenger is 1788# (working with 1500# payload to allow for 2nd passenger and dog)..

Looking at an Outdoors RV 24RKS with a dry weight of 6600#s, Dry hitch weight of 695#, GVWR of 9995, cargo/water/option capacity 3395, length of 28'8".

Trying to acknowledge all safety recommendations to keep myself and other safe on the road as well operate within legal and warranty obligations. On paper, looks like this trailer will work but your weight parameters suggest this trailer might be pushing it.