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I have a 98' Eddie Bauer 4x4 5.4l and I have towed a 25' enclosed trailer with 5 quads and a load of gear no problems, well let me refrase that. I used a load equalizer and I wasn't going to break any speed records, I was running 3000 rpms to stay at 65 mph and I got like 6 mpg, that was from Springfield, MO to Wynoka, OK (Little Sahara), on the way back I ran 3500-4000 rpms and ran about 70+.
You should have no problem towing a 21 foot boat as long as its not a cabin cruiser (sleeping quarters) and a 20 foot enclosed trailer should be fine too.
I believe the stated towing capacity on mine is 8000 pounds.
http://www.motorcraftservice.com/pubs/content/~WOWEXD/~MUS~LEN/41/98exdog1e.pdf
Page 119
You are correct that the Expy will haul it with out a problem, BUT since he stated that it has a RESSE hitch that makes me think HE DOES NOT HAVE THE FACTORY TOW PACKAGE!
If he starts putting on that kind of weight with out making sure that he has a class IV hitch he could be putting lives in danger. Also with out the tow package that means he does not have the aux. trans cooler and could end up blowing the tranny up.
If you just have the mentallity that it will haul it no matter what some one is going to get hurt eventually, that is why I asked him to put up the other info to advise if his truck is capable!
If you have the 7 pin plug at the back then you very well may have the HD tow package. If you look in front of the radiator ( thru the grille ) you will see a small cooler on the drivers side which is your power steering cooler, and if you do have the tow package then you will see another cooler on the passanger side which is the aux trans cooler if equipped.
If you do have the HD tow package then you are equipped with a class IV hitch and will have a GCWR ( Gross Combined Weight Rating = Weight of Expy and all gear and passangers + weight of trailer) depending on your gear ratio of :
4x4
Engine | Gear Ratio | Rim Size | GCWR | Max trailer weight
5.4 L | 3.31 | (16 in) (12000 lb) (0-6400 lb)
5.4 L | 3.73 | (16 in) (13500 lb) (0-7900 lb)
5.4 L | 3.73 | (17 in) (13000 lb) (0-7400 lb)
(above info taken from the 1997 Ford Expedition Owners manual pg. 128)
Link to Owners Manual :
http://www.motorcraftservice.com/pubs/content/~WOVEXD/~MUS~LEN/41/97exdog1e.pdf
Once you find out which gear ratio you are equiped with ( if you don't know take your VIN # to your local Ford dealers parts department and have them pull a "as built" spec sheet - this will give you all info about your truck including gear ratio and IF IT IS EQUIPPED with the HD tow package) then you can go down and have your Expy scaled out to find out your exact curb weight ( make sure to have the gas tank full ) then do the fallowing calculation :
GCWR - Gross = Weight of trailer
Example:
GCWR of 13,500
Curb weight (for example only) 5,600
13,500 - 5,600 = 7,900lbs
So for the above example you could safely haul a trailer that weighs 7,900# but at this weight you would have to have a LOAD DISTRIBUTION HITCH, AND SOME SORT OF BRAKES EITHER SURGE OR ELECTRIC!
Don't forget that any time you add more "gear" or another person inside the Expy that you need to deduct that weight from the amount of weight you can safley haul (the weight of trailer you can haul will decrease). If you fallow this you will always be within your vehicles limits.
Happy towing and if you have any other ? feel free to ask