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10-07-2020, 08:15 PM #31
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10-08-2020, 06:37 AM #32
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I did a bit more digging and found a post w/ some details on the 351M I didn't see the first couple of times I looked. Not quite as detailed as yours, but has some good base numbers for the 351M.
https://www.mygrandrv.com/forum/show...-Momentum-351M
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10-08-2020, 02:03 PM #33
It is not a Momentum, but let me offer some data on my 3740BH-R for reference.
"Dry Pin Weight" advertised online is 2900#
I have my tools in pass through, batteries/inverter/solar installed, 40# propane tanks (upgraded), Onan generator added, Washer and Dryer in front closet. Replaced 1621HD Pin Box with a Reese GooseBox 20k. My REAL pin weight is a hair over 4k. I added probably 1500# of food and supplies in the rear bunk room, that paired with adding the full-coverage solar dropped my pin weight only 80# (but raised the total trailer weight by 2500#)2019 GMC Sierra 3500HD Denali Diesel DRW (Crew Cab | 8 Ft bed | OEM Puck System | Curt Gooseneck Ball for OEM Puck | Timbrens on rear axle)
2019 Grand Design Solitude S-Class 3740BH-R Fifth Wheel (Onan 5500W LP Generator | MORryde CRE3000 and HD Shackles/Wet Bolts | 3x MORryde Cross Members | 8k Axles and Disc Brakes | Sailun S637 ST | Reese GooseBox 20k 2nd Gen | Splendide Stackable Washer and Dryer)
Full Suite of Victron Energy Products (2x 5k 24v Quattro Inverter/Charger | 2x 25.6/200 LFP Smart LiFePO4 Batteries | 2880w of Solar Panels across 4x MPPTs | Cerbo GX)
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10-08-2020, 04:14 PM #34
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Your data is a good example of why the rule of thumb of 20-25% of the total weight may be good for a non-toyhauler 5th wheel, but not for a toyhauler. The structure for the garage in the back adds significant load behind the axles that greatly helps reduce the pin weight. The toyhaulers also have tend to have less basement storage for heavy items like tools. My tools are in the garage along with the washer and dryer, all helping reduce the pin weight.
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10-08-2020, 04:15 PM #35
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10-08-2020, 11:07 PM #362019 GMC Sierra 3500HD Denali Diesel DRW (Crew Cab | 8 Ft bed | OEM Puck System | Curt Gooseneck Ball for OEM Puck | Timbrens on rear axle)
2019 Grand Design Solitude S-Class 3740BH-R Fifth Wheel (Onan 5500W LP Generator | MORryde CRE3000 and HD Shackles/Wet Bolts | 3x MORryde Cross Members | 8k Axles and Disc Brakes | Sailun S637 ST | Reese GooseBox 20k 2nd Gen | Splendide Stackable Washer and Dryer)
Full Suite of Victron Energy Products (2x 5k 24v Quattro Inverter/Charger | 2x 25.6/200 LFP Smart LiFePO4 Batteries | 2880w of Solar Panels across 4x MPPTs | Cerbo GX)
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10-09-2020, 12:34 AM #37
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The numbers in my post were verified with a CAT scale so I am quite comfortable I get the pin weight changes I noted.
The same is true for the 351M data at the link posted above. In that case a 1,020 pound Spyder in the garage reduced the pin weight by 280 pounds as verified by a CAT scale. I get a bigger reduction than this from my 1,000 pounds of ATV/Motorcycle because I have them at the back of the longer garage on the 381M.
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10-09-2020, 07:16 AM #38
I must be underestimating the difference in geometry and weight distribution of a normal fifth wheel vs a toy hauler then. Hopefully this is all useful for the OP!
You can see in my scale weights below, I added about 2500# between the 2nd and 3rd line. That breaks down to about 500# in passthrough for inverters, batteries, electronics. 500# distributed end to end on the roof for 14x solar panels. 1500# in the bunkhouse at the back of the RV and well behind the axles of food, drink, supplies (we completely cleaned out our house and loaded it all into the trailer). Yes, I know we were well over weight for the rating of our trailer, axle and spring upgrades are happening next week and we should never be loaded that heavy again (not planning to move again any time soon, quite the hassle haha). See where these loads and axles are located in below image of my floorplan.
Last edited by cookinwitdiesel; 10-09-2020 at 07:20 AM.
2019 GMC Sierra 3500HD Denali Diesel DRW (Crew Cab | 8 Ft bed | OEM Puck System | Curt Gooseneck Ball for OEM Puck | Timbrens on rear axle)
2019 Grand Design Solitude S-Class 3740BH-R Fifth Wheel (Onan 5500W LP Generator | MORryde CRE3000 and HD Shackles/Wet Bolts | 3x MORryde Cross Members | 8k Axles and Disc Brakes | Sailun S637 ST | Reese GooseBox 20k 2nd Gen | Splendide Stackable Washer and Dryer)
Full Suite of Victron Energy Products (2x 5k 24v Quattro Inverter/Charger | 2x 25.6/200 LFP Smart LiFePO4 Batteries | 2880w of Solar Panels across 4x MPPTs | Cerbo GX)
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10-09-2020, 10:37 PM #39
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I am really surprised you didn't see more of a pin weight reduction given where the load was in the back of the RV. It looks like the weight is pretty far back from the axles so I would have expected to see a higher pin weight reduction.
I like the spreadsheet and the way you showed the axles and load location on the image!
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10-10-2020, 08:38 AM #40
I was also surprised, certainly could USE the pin weight reduction haha - right at the rated limit for the GooseBox (thing is a champ!)
I cannot load much at all into the mid area of my trailer due to the slides. Fridge and Pantry is it. Fresh tank is right over the axles. You can see why I was a little skeptical of the talk about large changes in pin weight from a loaded garage! I had as much weight in my bunk room as most would a garage.
I do not have a picture of fully loaded, but we really went to town....lol
Last edited by cookinwitdiesel; 10-10-2020 at 08:45 AM.
2019 GMC Sierra 3500HD Denali Diesel DRW (Crew Cab | 8 Ft bed | OEM Puck System | Curt Gooseneck Ball for OEM Puck | Timbrens on rear axle)
2019 Grand Design Solitude S-Class 3740BH-R Fifth Wheel (Onan 5500W LP Generator | MORryde CRE3000 and HD Shackles/Wet Bolts | 3x MORryde Cross Members | 8k Axles and Disc Brakes | Sailun S637 ST | Reese GooseBox 20k 2nd Gen | Splendide Stackable Washer and Dryer)
Full Suite of Victron Energy Products (2x 5k 24v Quattro Inverter/Charger | 2x 25.6/200 LFP Smart LiFePO4 Batteries | 2880w of Solar Panels across 4x MPPTs | Cerbo GX)
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