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The 12’ Uhaul trailers are capped at 2500lb. The only way you’re going over capacity is if you load up your truck within 300lb of payload limits before adding in the tongue weight of the trailer.
That is a link to a PDF I found when I google searched 2018 F150 towing guide. It can be a bit confusing but you will need to know your axle ratio, from there you can find the correct row in the 5.0 section of the conventional towing graph and find your max trailer capacity under the Super Crew column for the shorter wheel base of 4X4 (WD hitch required to meet maximums which a U-Haul wont be). That chart will also give you your gross combined weight rating at the left of the graph in the same row as you trailer capacity. Your door sticker should tell you your gross axle weights and your payload capacity. At the bottom of page 5 of that PDF it will give you the max trailer capacity limited by the hitch without use of a WD hitch of 5,000 pounds gross trailer and 500 pounds of tongue weight
If you google search U-Haul trailer capacity the first link will show their 6X12 cargo trailer as having a GVWR of 4,400 so if you don't over load the rental or load it unbalanced (you want 10-15% of gross as tongue weight) you should be fine for the towing capacities and assuming you don't fill the bed of your truck super full you also shouldn't exceed GAW or GVW (tongue weight is counted as payload)
Yep I was actually serious this is the first time ever hauling a trailer. My son is moving out of state and we're hauling his stuff in the trailer.
I asked because I was presented with the below from the Uhaul website. I assumed I would not have any towing issues but since they asked and I had no idea. Total weight of his stuff is no more than 1500 lbs.