What would be the approx. shift of weight if I move a 40 lbs spare from the front of a fiver to the rear bumper. Would the pin weight go down by approx 80 lbs? I know there could be a lot of variables but would 80 lbs a good guestimate.

I doubt you'd see at the most about a 50lb difference, 40lbs. for the tire and about 10 lbs. because of the lever factor if that much. If you're trying to lighten you pin weight then you'll have to move a BUNCH of weight inside the trl from front to rear.

What would be the approx. shift of weight if I move a 40 lbs spare from the front of a fiver to the rear bumper. Would the pin weight go down by approx 80 lbs? I know there could be a lot of variables but would 80 lbs a good guestimate. It depends on the distance from the current spare location relative to the center of the axles and the new position on the bumper also relative to the axles. If you have a Sherline or other scale just move the spare and measure pin weight before and after.

Weight times distance = weight times distance.So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.like this. 40 X 15 = 600 (to location of spare is 15 feet)then X (at the pin) times (say 20 feet) would then work out X is 30So.. taking the 40 pound tire off will drop the pin weight by 30. Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet. Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.

Artum Snowbird wrote:Weight times distance = weight times distance.So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.like this. 40 X 15 = 600 (to location of spare is 15 feet)then X (at the pin) times (say 20 feet) would then work out X is 30So.. taking the 40 pound tire off will drop the pin weight by 30. Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet. Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.Great math, BUT the tandem axles are not a great fulcrum! :SAlso is the bumper strong enough?? Mine is just back of the axles in an under carriage mount. :B

rhagfo wrote:Artum Snowbird wrote:Weight times distance = weight times distance.So, a spare tire in front 40 pounds at (distance from center of axles) will equal less weight on the pin.like this. 40 X 15 = 600 (to location of spare is 15 feet)then X (at the pin) times (say 20 feet) would then work out X is 30So.. taking the 40 pound tire off will drop the pin weight by 30. Use that now to where the tire goes on the back. Maybe only ten feet behind the center of axles. So.. 40 at 10 feet = only 20 at 20 feet. Removing the wheel takes off 30. Putting it behind (in my case) would take off 20 more. So a loss in pin weight of 50 pounds.Great math, BUT the tandem axles are not a great fulcrum! :SAlso is the bumper strong enough?? Mine is just back of the axles in an under carriage mount. :Bx2 on the bumper strength. You'd likely need to add another 20 lbs of weight for a bumper beefy enough to hold the spare tire. Even then, you'd likely want to mount the spare as close to the frame as possible to minimize flex.Lyle

Moving spare tire to rear | Good Sam Community

Hvyhauler
Explorer
Dec 16, 2015
rhagfo wrote:
Hvyhauler wrote:
I moved both mounted spares to the rear slide out bumper several years ago for easy access,the covered tires sit on top of the bumper and are bolted to an aluminum rack I made.

The move was "not" payload related.

BOTH spares??

May I suggest you by better tires.

Our 5er rides on Michelin XPS ribs... as noted in my signature, the ribs have been flawless for over 3 years and many thousands of miles.

The 2 st spares are left over from the junk tire days of old and may come in handy for someone else on the road with a tire problem & short distance to go, both are still under 4 years old.

I see tire failures on just about every trip we take and will gladly give a tire / wheel to anyone who needs help and even change it for them if necessary.

I do appreciate your concern though.
rhagfo
Explorer III
Dec 16, 2015
Hvyhauler wrote:
I moved both mounted spares to the rear slide out bumper several years ago for easy access,the covered tires sit on top of the bumper and are bolted to an aluminum rack I made.

The move was "not" payload related.

BOTH spares??

May I suggest you by better tires.
Hvyhauler
Explorer
Dec 16, 2015
I moved both mounted spares to the rear slide out bumper several years ago for easy access,the covered tires sit on top of the bumper and are bolted to an aluminum rack I made.

The move was "not" payload related.
bid_time
Nomad II
Dec 16, 2015
meesda wrote:
I'm presently towing a 33 ft FW with a 2008 2500HD. We are looking to downgrade both FW and pickup and just trying to figure max pin weight for either a 2016 F150 SuperCab (2000 payload) or a 2016 F150 SuperCrew with HD payload (2400 payload). Not trying to revive any 1/2 vs 3/4 ton debate. We are not fulltimer and we would be well served by a smaller FW. I appreciate everyone input. Thanks
Just buy a TT and you'll automatically lose about 800 lbs of pin weight. That's how I got down to a 1/2 ton towable RV.
Old-Biscuit
Explorer III
Dec 16, 2015
A 5vr with a GVWR of 10,000# IF you go with the 2016 F150 SuperCrew HD

2016 F150 Towing Guide
laknox
Nomad
Dec 16, 2015
meesda wrote:
I'm presently towing a 33 ft FW with a 2008 2500HD. We are looking to downgrade both FW and pickup and just trying to figure max pin weight for either a 2016 F150 SuperCab (2000 payload) or a 2016 F150 SuperCrew with HD payload (2400 payload). Not trying to revive any 1/2 vs 3/4 ton debate. We are not fulltimer and we would be well served by a smaller FW. I appreciate everyone input. Thanks

IMO, don't even consider the SuperCab; go for the SuperCrew and the heavier payload.

Lyle
Allworth
Explorer II
Dec 16, 2015
If you are that close to overloaded. the spare is the least of your problems.
Slownsy
Explorer
Dec 16, 2015
Newer herd of a FW having a spare on front, as said by others most rear bumpers not strong, ? U are trying to get pin weights for 150. Stick with old truck or get a lighter FW or trailer.
Frank.
ford_truck_guy
Nomad
Dec 15, 2015
just put 2 cases of BEER in the front to balance the weight
meesda
Explorer
Dec 15, 2015
I'm presently towing a 33 ft FW with a 2008 2500HD. We are looking to downgrade both FW and pickup and just trying to figure max pin weight for either a 2016 F150 SuperCab (2000 payload) or a 2016 F150 SuperCrew with HD payload (2400 payload). Not trying to revive any 1/2 vs 3/4 ton debate. We are not fulltimer and we would be well served by a smaller FW. I appreciate everyone input. Thanks

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