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Old 08-14-2015, 05:24 PM   #15
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1979 31' Sovereign
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I dug up my manual and found those options and corresponding weights. I calculated almost 700 lbs of options that I have, so that leaves only about 300lbs unaccounted for. Much better than the 1,000 lbs I couldn't explain before. I'm surprised things like the fridge, bal jacks, space locker, spare tire bracket, main step, etc are options and not standard equipment, but that does help explain some of the weight difference.

With a combined axle rating of 6400 lbs, I don't have much room for extra stuff. When I replace my axles can I upgrade them, or does the frame and GVWR of 7100lbs limit me?
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Old 08-14-2015, 05:31 PM   #16
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In review ... from a 1975 owners manual for a 31' center bath double bed, in parenthesis is my explanation

7,100# GVWR Gross Vehicle Weight Rating (total allowable trailer weight)
4,970# factory weight without options or variable weights [separate table - everything from AC to dual pane windows, and all tanks] (how much the trailer itself weighs)
2,130# allowable additional total weight including personal cargo (how much your extra stuff and options can weigh - to include all tanks)
6,400# GAWR Gross Axle Weight Rating (of the 7,100# GVWR, how much is supported by the axles)
4,280# Factory Axle Weight (how much weight is on the axles before adding options or personal stuff)
2,120# allowable additional weight (how much more weight in options and personal stuff - to include fresh, gray, black and propane tanks - the trailer can carry)
690# factory tongue weight without options or variable weights

Different from the above, I found this a useful review for our 75 Overlander which started life as a twin bed rear bath, but a PO removed one of the beds, put in partial full bed cabinetry, and the front goucho is a skeleton frame reminder of its former self. So rough guess is I get maybe another 200# worth of stuff I get to put in it in addition to the 1,600# from the chart. Add up the options and variables ...

weight on
total/axles/tongue
150/128/22 - AC
60/46/13 - stabilizing jacks
66/8/58 - LPG 10 gal alu tanks full
5/2/3 - TV antenna
373/266/107 - fresh water tank full
83/55/29 - water heater 10 gal full
60/78/-18 - waste tank (at rear of trailer so subtracts from tongue weight)

797# total added weight from options and variables
583# of that total added weight on the axles
214# of that added weight on the tongue

So from the approximately 1,800 pounds of stuff I can add to the trailer, only about 1,000 pounds can used if my tanks are full.
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Old 08-14-2015, 05:38 PM   #17
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Why is my 1979 so heavy?

Quote:
Originally Posted by KYAirstream View Post
With a combined axle rating of 6400 lbs, I don't have much room for extra stuff. When I replace my axles can I upgrade them, or does the frame and GVWR of 7100lbs limit me?

Possibly. This would be a good time for Andy or Colin to reply. I seem to remember something about only increasing axle capacity by a certain percentage. This likely has more to do with the rest of the chassis and tongue being stout enough to do the work of an axle of greater capacity.
For example we could modify the suspension at the axles of a Ford Pinto to hold up 10 tons, but when fully loaded and attempting to move it, it will fold like a beer can.
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Old 08-14-2015, 05:42 PM   #18
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Why is my 1979 so heavy?

Have you been to the scales? It'd be interesting to compare your calculated weights to scale weights.

My trailer is 6660lbs with only fluids (water and propane) on board, leaving me with room for only 440lbs of stuff before reaching the GVWR of 7100lbs.
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Old 08-14-2015, 06:06 PM   #19
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No, since we've had it, we haven't taken it to scales. It might be interesting to see how it weighs - actual compared to chart weights - before loading up and heading out of here. Especially since the axles are borderline (slight down decline, only a 2" change when raised instead of 3").

This owners manual has a sample problem for calculating how much of your stuff you can add to a 31' after various variables and options - roughly 1,000#.

One thing I didn't adjust for is the replacement finish floor, and the two extra batteries mounted on the bumper.
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Old 08-14-2015, 06:11 PM   #20
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If you happen to take it to the scales, please post back to this thread. I was surprised how heavy mine turned out to be, so I'd be curious to hear your results especially since you have a 70s center bath like mine.
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Old 08-14-2015, 06:44 PM   #21
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Our 75 is an Overlander, 27' rear bath ...
but sure.
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Old 08-14-2015, 07:37 PM   #22
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Sorry, overlooked that as I was focused on your breakdown of the weights. Would still be interesting to see your scale readings though.
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Old 08-23-2015, 07:52 AM   #23
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Factory weights do not include awnings either.
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Old 08-23-2015, 08:32 PM   #24
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Thanks. Three awnings on my 31 footer, so I imagine those add up to a fair bit of weight too.
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