Not sure what model SLX you have but the heaviest of them tops out at 3500lbs GVWR. And your Flex should have a 4500lbs tow rating if using a weight distributing hitch.
Sounds like you should be just fine. Take it to a CAT scale the first trip out and weigh everything and you will know where you are and if you need to adjust anything.
Cheers
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2014 Jayco Swift 281BHS, 300W Solar!
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
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