Max tow = 9500# MINUS everything in the truck except a 150# driver.
Fiver UVW = 8300#.
Add the weight of a hitch, propane tanks, battery(ies) and other options to the fiver and I have a feeling you just ran out of payload before you even put a case of beer in the fridge!
1999 Sunnybrook 27RKFS Fiver.
2005 GMC Sierra 2500HD CC/SB/DA 2WD, LBZ air cleaner, 52 gal Titan tank, Bilsteins, Line-X, Westin steps, Prodigy, Retrax cover, 16K Superglide, 5th-Airborne pin-box, Multi-vex mirrors, TST TPMS.
Scale it. then you will have all the info you need to make a good decision. Then you will have the tow rating in the manual. The door sticker then the scaled numbers to see what capacity you have left.
1997 Ford F250 Extended Cab, 7.3 Diesel, 8 foot bed.
Reese 16K Hitch
(Moved into Shed) Hensley Arrow
Jordan Brake Controller, Hensley TruControl Gold Shelved.
Open Range 5th Wheel, Roamer RF392 BHS
Sounds like you would be at or just over your tow ratings. I would expect you could tow it fine (except the gas stops), but you would enjoy it more with a diesel with those weights. Pay attention to the ratings with the diesel, 2500 don't have as much payload as you would expect sometimes...
You "COULD" also change the gears on the pumkins out to 4.10s, and get to a facotry rated 16 or 16500, 4.56 would put you at 19000 or close to there abouts......
Reality is, IF you can stay under the axel ratings, yes over the GCWR, you can and will be safe! You may be a bit slow. but the 454 IIRC was rated at 290/440 or there abouts in your year, so frankly, you have the power! No whether or not you have the springs/tires to handle the pin load.
Your rear is probably 2400 empty, add say 2000 lbs loaded you are now at 4400 on a 6100 rated rear end.....still room to go before overloading.
If it were me, I would change out the rear springs by getting a new pack by adding one or two leafs to the main pack a bit thicker, call it a day, unless I felt I did not have the initial go power, then change out the axel gears to lower ones, if I did, I would go all the way to 4.56 frankly. As the real culprit is the tranny with its rediculously tall 2.48-1 or about 4-1 with the TC enguages 1st gear. OR< you could rebuild the tranny, and put the first two gears from a 4L60E in it, and go from a 2.58 to a 3.08 first gear, and do the same or a bit more than going to 4.10s still have some freeway tall gears for empty MPG's......
Then again, you could go with a newer rig......A 3500 in the model you have only has a 9200 GVWR< you will gain about 500 lbs of payload. the DUally has a 10K gvwr, frankly, your payload gain will be all of maybe 600-700 lbs. WOrk with what you have and you might be better off. Also going to 265-75-16 rubber would give you another 800 lbs of tire capacity.
No reason to worry about GCWR< other than for civil court cases, as legally this number is non existant, and your warrenty is gone..........
05 Chev CC D/A LS Dooley
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
00 Chev C2500, V5700, 4L80E, 4.10, base truck, no options!
92 Red-e-haul 12K equipment trailer
3 Single axle utility trailers