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Thread: 2800BH tires rubbing
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07-27-2018, 07:02 AM #31
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Hmm, that might also explain why the passenger side is getting more hit than the drivers side.
I’m willing to bet dollars to donuts that with all the appliances (fridges, furnace, pumps, radio, TV, food, plates, dishes AND the storage under the rear bunks is ALL on the passenger side would cause that side to be heavier than the drivers side.
There is almost no extra weight on the drivers side as the side takes it all up.
Cheers
Tim2022 Momentum 25G (aka "Baby Mo")
2020 Ram 3500 Laramie SRW | 6.7 HO Aisin | 6’4” bed | 3.73 gears | air suspension | 3694# Payload
Blog Post: 1500 Pickup’s and Towing - The REAL numbers with example
Blog Post: 2016-2018 Imagine 2800BH - 3500 lb Axles Tire Rubbing Issues
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07-27-2018, 07:12 AM #32
Tim - Set your trailer parallel to the ground (equalizer centered) and measure the spring arch heights.
See https://www.mygrandrv.com/fo...ng-Arch-Height for the process.
This will give you spring compression numbers for each corner that are proportional to load.
If you want to go one step further, a Sherline scale on a floor jack can be used to lift each wheel position to measure actual weight carried. I did this on a wooden block fitted to the bottom two lug bolts so that I would get weights right at the tire centreline.
Rob
Cate & Rob
2015 Reflection 303RLS
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07-27-2018, 08:46 AM #33
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Joe & Dee
Ontario, Ohio
2018 Chevy 3500HD LTZ Duramax Crew Cab SRW Short Bed Payload 3523#
2019 Reflection 337RLS bought February 2019 Dry Pin Weight = 2,320#, UVW = 11,100#
Hitch - PullRite Super Glide 2700 - 16K
Bed Cover - Roll-N-Lock
TPMS - Tire Tracker TT-500 (non flow thru)
Rear Observation Camera - Rear View Safety model RVS-155W-FB (2400-2500MHZ)
2017 303RLS bought April 2017 / Traded February 2019
Map represents States visited with our 303RLS /337RLS
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07-27-2018, 09:53 AM #34
Hi Joe,
I lift the corner to be tested with my combination bottle jack & axle stand. I measure the distance from the axle to the ground before I start the lift. Then, remove the wheel and lower the bottle jack back to where the axle is slightly below the distance above the ground that it was before you started. Now, using the floor jack, the Sherline scale and the wooden block (note that that is a close grained oak block) lift until the gauge stops increasing, which will be just as the weight comes off the axle stand. The Sherline scale is now holding the same weight that the wheel and tire normally carry. This is best done with the forward weight on the pin, not on the landing gear, using either the truck or a pin tripod. This is because the landing gear is closer to the trailer suspension and will carry more of the trailer weight than the pin would when towing.
RobCate & Rob
2015 Reflection 303RLS
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07-27-2018, 09:57 AM #35
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Joe & Dee
Ontario, Ohio
2018 Chevy 3500HD LTZ Duramax Crew Cab SRW Short Bed Payload 3523#
2019 Reflection 337RLS bought February 2019 Dry Pin Weight = 2,320#, UVW = 11,100#
Hitch - PullRite Super Glide 2700 - 16K
Bed Cover - Roll-N-Lock
TPMS - Tire Tracker TT-500 (non flow thru)
Rear Observation Camera - Rear View Safety model RVS-155W-FB (2400-2500MHZ)
2017 303RLS bought April 2017 / Traded February 2019
Map represents States visited with our 303RLS /337RLS
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07-27-2018, 01:04 PM #36
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07-27-2018, 05:02 PM #37
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Tim,
It is important to have the rig riding level when towing since the front axle will bear the majority of the load when a pot hole or other road hazard is encountered if its riding nose down. However, several of us have had issues with only the heavy right kitchen side where the original clearance is marginal at best. I installed all new OEM springs and lifted the unit by 1.75 inches so I have no clearance issues. But this will not prevent and undersized spring from flattening out, so we will see.MidwestCamper
Jim & Dawn
Near Milford, Michigan
2017 Imagine 2600RB
2015 GMC Sierra 1500 Double Cab 4x4
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07-27-2018, 05:17 PM #38
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Rob,
And those springs that many of us are discovering are too light and will suffer from higher velocity and higher kinetic energy. KE=1/2mV^2. As you know, the velocity term is squared so a small increase in velocity will result in much higher energy. The key as you have found is to size the spring accordingly or velocity will increase which can result in higher energy, not into the coach but into the spring which will yield. Cars have different spring rates from front to back so if the loads are different from side to side, the same approach would be needed.MidwestCamper
Jim & Dawn
Near Milford, Michigan
2017 Imagine 2600RB
2015 GMC Sierra 1500 Double Cab 4x4
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07-27-2018, 06:53 PM #39
Jim (MidwestCamper) - LOL! I knew that if someone was going to bring up the velocity and acceleration of the spring motion, it would be you . I think we need to get the static F=kx understood first .
In car assembly, (less important for trucks) bumper height is carefully regulated. There are a range of springs for every corner, selected based on vehicle option content to keep the front and rear bumper height within the required range.
RobCate & Rob
2015 Reflection 303RLS
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07-28-2018, 06:51 PM #40
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Our 2018 Imagine 2800BH (and I assume previous model years as well) has axles rated at 3,500-lbs. each and a GVWR of 7,495-lbs. Since our actual UVW came in at a portly 6,564-lbs., by the time we're loaded up and ready to go camping we're running close to the GVWR. When I crawled under our trailer to check torque on the nuts for the u-bolts the other week I noticed that the springs looked pretty flat. We haven't had the tires rubbing yet, but I'll be watching for it.
I noticed that the Grand Design website lists updated specs. for the 2800BH which include 4,400-lbs. rated axles and a GVWR of 7,995-lbs. It's interesting that while the axles now provide an additional 1,800-lbs. of rated capacity, the trailer's GVWR is only increased by 500-lbs.
A couple of questions come to mind -
1) Is this change from 3,500-lbs. to 4,400-lbs. axles due to Grand Design realizing that the springs on the 3,500-lbs. axles just weren't up to the task of carrying a trailer that would commonly be loaded close to the 7,495-lbs. GVWR?
2) Should those of us with 3,500-lbs. axles be thinking about swapping out for 4,400-lbs. axles, or at least the higher-rated springs, to avoid eventual flat springs and tire-rubbing problems?Joe & Joy + children
2018 Imagine 2800BH
2022 F250 Crew Cab 4x4 Tremor, 7.3L V8
Equal-i-zer 1,200/12,000 lb. hitch
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