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05-03-2022, 04:38 PM #51
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- Jan 2018
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- Florissant CO
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we have a 2022 390RK. I have my tires at max PSI 125. We have the coopers.
Dan and Kathy
2022 Solitude 390RK
2022 GMC Sierra Denali 3500HD Duramax
USMC Semper Fi
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05-03-2022, 05:09 PM #52
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- May 2022
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- SoCal
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Rob,
I am well aware this does nothing for the sticker on the side of the of the trailer. I am also well aware that when 390RKs ship from the factory with 8k axles they get a sticker that says 18,000 GVWR on the same frame. That does mean there are potential legal liabilities with putting 8k axles under it and towing more than 16,800, but the trailer is safe to operate and tow at the increased weight with the higher capacity axles. Heck I may even take it up with GD to try and get a new sticker with the additional weight capacity.
In 2022, Grand Design put "Lippert Rhino" frames under these trailers so be aware for anyone looking to swap out their pin boxes! I figured this out because I tried to put a Reese Goosebox on it and only four of the bolt holes would line up. It does not have the 1621 pin box frames of the previous years.
I seriously doubt this trailer weighed the "14,414 UVW" that is annotated on my sticker when it was empty. When we traveled we were very minimal in our packing and still barely made it under the trailer's GVWR.
ScottMy Truck: 2016 Ram 3500 Laramie, CCLB SRW 4x4, 68RFE, 6.7 Cummins, rear air. MODS: MM3 w/tunes, EGR and grid heater delete, GDP airhorn and heater, ARP head studs, 5" TBE, billet VB, Thuren .5" lift/sway, Fox remote res shocks, Morimoto HIDs and LED fogs. My 5th Wheel: 2022 Grand Design 390 RK, 3 ACs, Gen Prep, too much storage ~16,500 rolling.
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05-30-2022, 08:22 PM #53
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- Jan 2018
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- Florissant CO
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Scott,
Do you have disc brakes? We ordered ours with 7k w disk brakes. Like you, if we had known, we would have ordered the 8k w/ disks.
Do you already know the axle p/n yet? Does it come with springs and disk brakes?
I've been looking around and can't find a kit.
Thanks
DanDan and Kathy
2022 Solitude 390RK
2022 GMC Sierra Denali 3500HD Duramax
USMC Semper Fi
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05-30-2022, 08:36 PM #542021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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05-30-2022, 08:44 PM #55
Do you care about the sticker. or what is real? GD raises the GVWR when they install 8K axles at the factory. That gets a sticker stating so. You cannot get the sticker, but you CAN raise the physical GVWR, by installing 8K axles and matching tires.
That is what I would do.
On a side note: 8K axles will also get you stronger brakes, even more so if you go with discs (which I highly recommend)Last edited by huntindog; 05-30-2022 at 08:57 PM.
2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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05-30-2022, 11:35 PM #56
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- May 2022
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- SoCal
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Dan,
I found a company that will sell the whole kit and caboodle (brakes, axles, springs, etc) and that will probably be the direction we go.
I called Morryde about doing the 8k IS upgrade, but it is about $3,000 more and you have to drive to Indiana to get the best install. The advantage is that it is set to your tow rig and is a much better setup than the old straight axle. We will likely be upgrading our tow rig to a DRW setup so unless I have that truck, I wouldn’t do IS (budget pending of course).
https://performancetrailerbraking.com/disc-brakes
That is the place I found and most customers are pretty happy with them. I will do all of the work myself (if this is the route we go). Like any upgrade, if you look hard enough you will find someone that says it sucks.
As far as brakes, I run a stout setup on the truck. I have EBC orange stuff pads, Stoptech slotted rotors front and rear, and Lucas DOT 4 brake fluid. The trailer brakes are drum and setup aggressive with heavy electric and 6.5 gain. The trailer brakes are a little grabby, but it feels confident.
Good luck with it. Next month we are driving from San Diego, CA to Denver, to Colorado Springs, to Wyoming, to the Black Hills, to Denver and back to San Diego. I will make a better report after that with the current combination.
To get some headway in our limits, the truck just got 4.10 gears installed and I am putting Raceline wheels rated for 4,000lbs and Michelin LTX 295/70r18 that are rated to 4080lbs. The AAM 11.5 axle housing is rated to 10,000lbs so I am not so worried if I wind up a few hundred pounds heavier from our last trip.My Truck: 2016 Ram 3500 Laramie, CCLB SRW 4x4, 68RFE, 6.7 Cummins, rear air. MODS: MM3 w/tunes, EGR and grid heater delete, GDP airhorn and heater, ARP head studs, 5" TBE, billet VB, Thuren .5" lift/sway, Fox remote res shocks, Morimoto HIDs and LED fogs. My 5th Wheel: 2022 Grand Design 390 RK, 3 ACs, Gen Prep, too much storage ~16,500 rolling.
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12-10-2022, 06:08 PM #57
- Join Date
- Oct 2020
- Location
- Phoenix, AZ
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I've WAY overloaded our Solitude. But it has upgraded axles. Tires have been no problem, but we got expensive ones. Never any problems whatsoever.
2017 Solitude, F-350 towing, Anderson Hitch
Can you hand me the wrench? Thanks. 🤪
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12-17-2022, 08:36 AM #58
- Join Date
- Mar 2021
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- Verona, KY
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PTB are great to work with. I strongly recommend if you do the 8K axles, also do the disc brakes and the 17.5" wheels/H rated Cooper tires. PTB will send you everything you need except the wheels and tires. You can buy those already mounted from e-trailer and sell your old ones to recoup some money. You can also sell your old axles too. I had PTB come to me for the install. Took them about 6 hrs total and was well worth it to have them do the work. If you take your rig to a GD rally that they are at, they will do the conversion at the rally with a discount. That has to be scheduled pretty far in advance. If you do the 8K axles without the disc brakes and H rated tires, you will regret it!
New: 2021 Solitude 380FL
Prior: 2016 Alpine 3600RS
Tow: 2017 F350 Diesel Dually
Re-pack bearings necessary?
Today, 09:25 AM in Axles, Brakes, and Suspension