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11-06-2015, 08:48 AM
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#1
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Senior Member
Join Date: Jan 2014
Location: Los Lunas, New Mexico
Posts: 3,766
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Dolphin movement
Okay, here's the deal....I get occasional dolphin movement while pulling my TT. Not always but when the road "hills" are just right, I really notice the dolphin effect. here's my question, is this occasional dolphining okay? I use an Equalizer hitch that seems to be hooked up correctly but that dolphining really bugs me. I also keep a well balanced load. What do you think? Are there some corrections I can make to reduce or stop it?
Happy RVing,
Jeff
__________________
2018 Eagle HT 26.5 RLDS. SOLD
2009 F150 Supercab UNICORN, 5.4L ,3.73, HD and Max Tow Packages, Timbrens, Bilstein shocks.
Wet bolt kit. Andersen Ultimate 20K hitch. TST 507RV TPMS. Hydro Life HL-200. 16" Goodyear Endurance. Progressive EMS. SteadyFast Stabilizers. Furion backup camera.
Best friend wife, Di, and dog Cooper. RETIRED
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11-06-2015, 08:51 AM
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#2
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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I think it's just happenstance of road condition honestly. Mine does the same thing at specific spots that I've noticed.
__________________
2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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11-06-2015, 09:09 AM
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#3
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Senior Member
Join Date: Sep 2013
Location: South Texas
Posts: 7,216
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I believe the more accepted term is "porpoising", but whatever the word, I know what you're talking about. I used to get it sometimes when I was towing with my 1/2T GMC. I put Roadmaster Active Suspension (basically fancy helper springs) on and it helped somewhat. I really noticed it only on rough roads, and for me it manifested as an extra bounce or two more than I was comfortable with after a bump in the road. I rarely got it consistently over a long stretch of road like what you would experience on harmonic expansion strips on a bridge or the like.
Anyway, if all other factors check out (hitch, loading, etc.) like you mentioned, it's worth a look into some suspension enhancements. I used RAS, but others have used helper springs, or Timbren SES, Firestone air bags ... There are tons of options out there. I believe firming up the rear of the truck a little goes a long way to minimizing this problem. For me the added benefit was the unloaded ride; the empty truck behaved MUCH better after I firmed up the rear suspension.
__________________
-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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11-06-2015, 09:09 AM
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#4
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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How much water in which tanks?
Sloshing can make a curious situation turn into a brown pants moment rather quickly.
__________________
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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11-06-2015, 09:34 AM
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#5
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Site Team
Join Date: Nov 2010
Location: Virginia`s Eastern Shore
Posts: 17,092
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The concrete roads with expansion joints have been known to create the porposing effect in some tow vehicle/trailer configurations.
__________________
2017 Coachmen Catalina 283RKS
2018 Ford F250 Super Duty 6.2l CCSB
2010 Jayflight 28BHS (sold)
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11-06-2015, 09:36 AM
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#6
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Senior Member
Join Date: Feb 2014
Location: Fuquay-Varina
Posts: 437
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Look at the Rancho 9000 shocks. They are adjustable. I tow with mine set as stiff as they can go, but for everyday driving, I soften them up considerably. It has helped with the bounce you speak of. Dad even put them on his F250 and was impressed with how they smoothed out towing his 5er.
__________________
Steve
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2008 Jay Flight G2 29BHS
2017 Chevrolet Silverado 2500HD Z71
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11-06-2015, 10:56 AM
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#7
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Senior Member
Join Date: Aug 2015
Location: Cumming, Georgia
Posts: 144
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Mine does it as crabman mentioned on interstates that are concrete. I put airbags in my truck and it helps alot. If I slow down when it starts, it usually quits.
PS I'm not carrying water.
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2015 Jayco Eagle Premier 318RETS
2008 Ford F-250 Lariat CC Super Duty 6.4 Turbo Diesel
Cumming, Georgia
Go Dawgs!
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11-08-2015, 08:00 AM
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#8
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Senior Member
Join Date: Jan 2014
Location: Los Lunas, New Mexico
Posts: 3,766
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Hahaha. Yeah, I really meant porpoising, but they are about the same animal, right? Thanks for the responses. Anyway, I assume you can't take it all out, but if I reduce TV tire pressure, might that help? I'm running 65 rear and 60 front when I tow with my 1/2 ton.
Happy RVing,
Jeff
__________________
2018 Eagle HT 26.5 RLDS. SOLD
2009 F150 Supercab UNICORN, 5.4L ,3.73, HD and Max Tow Packages, Timbrens, Bilstein shocks.
Wet bolt kit. Andersen Ultimate 20K hitch. TST 507RV TPMS. Hydro Life HL-200. 16" Goodyear Endurance. Progressive EMS. SteadyFast Stabilizers. Furion backup camera.
Best friend wife, Di, and dog Cooper. RETIRED
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11-08-2015, 08:57 AM
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#9
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Senior Member
Join Date: Nov 2011
Location: Where ever the boss says we're going.
Posts: 16,077
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Lowering your tire pressure would make it worse since your tires would also flex more. Also could cause tires to overheat and fail.
__________________
DISNEY LOVERS
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11-08-2015, 09:13 PM
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#10
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Senior Member
Join Date: Jan 2014
Location: Los Lunas, New Mexico
Posts: 3,766
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Quote:
Originally Posted by Grumpy
Lowering your tire pressure would make it worse since your tires would also flex more. Also could cause tires to overheat and fail.
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Thanks for the info., Grumpy.
__________________
2018 Eagle HT 26.5 RLDS. SOLD
2009 F150 Supercab UNICORN, 5.4L ,3.73, HD and Max Tow Packages, Timbrens, Bilstein shocks.
Wet bolt kit. Andersen Ultimate 20K hitch. TST 507RV TPMS. Hydro Life HL-200. 16" Goodyear Endurance. Progressive EMS. SteadyFast Stabilizers. Furion backup camera.
Best friend wife, Di, and dog Cooper. RETIRED
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