Absolutely The F550 will handle it. The Ford PS 6.7 is a beast, not to mention the new 10 speed transmission. I have 2021 Thor Magnitude, and I also have a 2014 Ford F350 with the PS 6.7. I used to tow a 36 foot fifth wheel, with a 14 foot trailer loaded with a Kawasaki mule behind that. That F350 had the older turbo that is two generations behind and still handled super easy towing from Texas to South Fork, Colorado. That route goes across Raton pass and La Veta pass. Now that I have the Magnitude, last September I took the same route flat towing our F150 with a 15 foot trailer loaded with two ATV's behind that. No issues at all.
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