Reply
 
Thread Tools Display Modes
Old 06-20-2014, 05:37 AM   #21
Phat Phrog Stunt Team
 
AquaMan's Avatar
 
Join Date: Apr 2012
Location: Tipp City, OH
Posts: 6,477
Quote:
Originally Posted by Herk7769 View Post
But where does it stop?

Upgrade the tires; GVWR does not change; payload stays about the same.
Upgrade the axles; GVWR does not change, BUT payload goes DOWN due to heavier axles.
Upgrade the frame; GVWR STILL does not change because the walls are not built to handle the stress of a heavier load, PAYLOAD goes down even more.
Not entirely true. Several of us Sierra 365 owners have had their axles swapped out for heavier ones and received new weight stickers from the factory, with a higher GVWR.
__________________

__________________
2016 Georgetown 364TS
Nights Camped 2017 - 49
AquaMan is offline   Reply With Quote
Old 06-20-2014, 06:31 AM   #22
Canadian Member
 
itat's Avatar
 
Join Date: Feb 2012
Location: Eastern GTA, Ontario, Canada
Posts: 2,900
AquaMan, if that's the case it suggests that at least your Sierra's chassis is designed like a flatbed with the walls contributing nothing to the GVWR. That is, they don't act as a truss contributing to the load carrying ability. They simply support themselves and anything hung on them.
__________________

__________________
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer WDH
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73, w/ snow plow & camper pkgs.
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 5'6" bed (2012 - 2016)

itat is online now   Reply With Quote
Old 06-20-2014, 06:41 AM   #23
Phat Phrog Stunt Team
 
AquaMan's Avatar
 
Join Date: Apr 2012
Location: Tipp City, OH
Posts: 6,477
Quote:
Originally Posted by itat View Post
AquaMan, if that's the case it suggests that at least your Sierra's chassis is designed like a flatbed with the walls contributing nothing to the GVWR. That is, they don't act as a truss contributing to the load carrying ability. They simply support themselves and anything hung on them.
That's most likely true, especially at 42' long. It should also be noted that the 365's were coming from the factory with 2 different axle weights, 6k & 7k, although I think they switched to all 7k's now, so the walls and framing were capable of supporting the extra weight.
__________________
2016 Georgetown 364TS
Nights Camped 2017 - 49
AquaMan is offline   Reply With Quote
Old 06-20-2014, 06:44 AM   #24
Senior Member
 
Witch Doctor's Avatar
 
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 7,625
Quote:
Originally Posted by HSVBamaBob View Post
We have a goodyear dealer right down the road from our house. Was in there a couple of days ago with my son to get an alignment on his MR2...asked the manager about RV tires. Was delighted to find out that:
1. Yes Goodyear makes RV tires
2. The tires are one of the last brands to be made in the USA!
3. They offer a replacement hazard warranty!

Goodyear RV Tires – Tire Selector

Will be getting rid of my China Bombs RSN!

Oh, forgot to mention that Goodyear offers a G rated tire - that is a lot of tire for a Ultra Lightweight (Tire Size: LT235/85R16 Max Load at 110PSI is 3750 )
BamaBob, Your rims are rated at 60 PSI on your unit same as mind, I went to D rated. Plenty of tire for your rig. Also all Good Year ST are now made over seas. I think Herk might have the last one's made in the US. That's only ST through if your looking at Lt or something they are still made in the USA I think. I bought GY a couple of years ago and run them at 60CP but they climb to 70 psi fast no problem yet......
__________________
Rockwood #8289 WS 2012
F250 6.0 / Husky 16k
With 4 point leveling system
Witch Doctor is offline   Reply With Quote
Old 06-20-2014, 06:56 AM   #25
Incheon, S. Korea
 
BigBaron's Avatar
 
Join Date: Jul 2012
Location: Incheon, South Korea
Posts: 1,140
Quote:
Originally Posted by Herk7769 View Post
But where does it stop?

Upgrade the tires; GVWR does not change; payload stays about the same.
Upgrade the axles; GVWR does not change, BUT payload goes DOWN due to heavier axles.
Upgrade the frame; GVWR STILL does not change because the walls are not built to handle the stress of a heavier load, PAYLOAD goes down even more.
Not necessarily true. The axles are unsprung weight. Any additional weight from the axles will only increase the trailer weight by the same amount, not reduce the payload capacity.
__________________
Me, Julie, Lil' Barry, Faith, and OSDs, Fang and Treaty
2003 Hyundai Starex (H1), 2012 Coachmen Clipper 126
I don't know when we'll be able to go camping again...
BigBaron is offline   Reply With Quote
Old 06-20-2014, 07:27 AM   #26
Member
 
Join Date: Mar 2014
Location: south ga
Posts: 61
my salem 27rkss came with 3500lb axles. tires lasted less than 3000 miles. so after a lot of hassle lippert and forest river decided to change the springs and put 5200lb axles. so I am thinking they know there is not enough axle under most of there trailers, and just for information I weigh this camper regularly and it has never been close to overloaded. just my 2cents worth.
__________________
rr retired is offline   Reply With Quote
Old 06-20-2014, 08:03 AM   #27
Phat Phrog Stunt Team
 
AquaMan's Avatar
 
Join Date: Apr 2012
Location: Tipp City, OH
Posts: 6,477
Quote:
Originally Posted by BigBaron View Post
Not necessarily true. The axles are unsprung weight. Any additional weight from the axles will only increase the trailer weight by the same amount, not reduce the payload capacity.
You're mistaken. Any weight added to the scale, sprung, unsprung, a concrete block sitting on the scale, will take away from your payload capacity. The GVWR is a set number.
__________________
2016 Georgetown 364TS
Nights Camped 2017 - 49
AquaMan is offline   Reply With Quote
Old 06-20-2014, 11:29 AM   #28
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,169
Quote:
Originally Posted by AquaMan View Post
Not entirely true. Several of us Sierra 365 owners have had their axles swapped out for heavier ones and received new weight stickers from the factory, with a higher GVWR.
It is quite possible that they needed to do a new engineering study due to a faulty floor decision. Sometimes when a model is built, the floor supervision needs to "make a call" about shutting down the assembly line to pressing on with a substitute that "may be close." (RE: Chevy starter switches). Maybe the original spec called for the bigger axles but they were not available in time; so the limit (GVWR) for the "in stock" axles were used.

I had a 1985 Ford Ranger with manual transmission that blew the clutch 6 months out of warranty and found out the OEM clutch plate was only using the outside 1/2 inch of plate material. The correct clutch plate was out of stock, and rather than shut down the line, they substituted a smaller diameter one "that fit."

What Lippert said (when I talked to their engineers at last year's rally) was that if I had my axles upgraded they needed to do a complete engineering study to determine what was the next limiting factor to determine the new GVWR. They wanted to know if I was willing to pay for it.

Still have OEM axles...
__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 06-20-2014, 11:30 AM   #29
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,169
Quote:
Originally Posted by AquaMan View Post
You're mistaken. Any weight added to the scale, sprung, unsprung, a concrete block sitting on the scale, will take away from your payload capacity. The GVWR is a set number.
Since the GVWR does not change, heavier (weight) axles will reduce your payload by definition.
__________________

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 06-20-2014, 02:21 PM   #30
Senior Member
 
Airdale's Avatar
 
Join Date: Jul 2013
Posts: 734
Just saying. And speaking from a regulatory viewpoint:

For RV trailers the GAWR is set by the trailer's manufacturer. Increasing axle load capacities has zero effect on GAWR or for that matter GVWR.

The only official hitch weight is found in the trailer's original specifications. It's value combined with certified total GAWR must equal or exceed the trailer's GVWR.

GVWR can only be changed by the vehicle manufacturer or a certified modifier.

Airdale
__________________

__________________
Airdale is offline   Reply With Quote
Reply

Tags
axle

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:18 PM.