How to Reduce Ford F-250 Jiggling From Grand Design Travel Trailer

Updated 04/09/2024 | Published 03/23/2024

Products Featured in This Question

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung

(65)

$299.99

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 5K to 8K - Overslung

(304)

$294.99

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 5K to 8K - Underslung

(65)

$320.99

SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung

(304)

$267.99

Question:

We just bought our first 33ft Grand Design travel trailer and Im pulling it with a brand new F250SD 7.3 Godzilla. When we go down the interstate on concrete, this entire set up jiggles like crazy but when on blackl top it is very smooth. I realize there might be some heaving in the concrete during winter here in central Wisconsin but this jiggling is BAD! Do you have any products or suggestions for our set up to smooth this out? Thank you. Kind regards, Dennis

asked by: Dennis M

Expert Reply:

There are a few different things you can do to help with this. It would also be helpful to know what kind of jiggling you're experiencing. Does it just feel bouncy and rough? Is it side to side motion? If your travel trailer weight is more than 50% of your trucks GVWR then it would be a good idea to use a weight distribution hitch which will level you out and reduce sway.

If it is more like a rough ride then you could try an upgraded equalizer, shocks, or adding something like SumoSprings to help smooth it out. For SumoSprings you can choose from the following based on axle capacity and configuration:

-SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Underslung # TSS-106-40

-SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 3K to 5K - Overslung # TSS-107-40

-SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 5K to 8K - Overslung # SS26MV

-SumoSprings Trailer Helper Springs w/ Line Relocation Bracket - Single Axle - 5K to 8K - Underslung # SS33HR

If you let me know exactly which Grand Design you have I can look up specs and parts on their site to give you a better idea on which weight distribution hitch or upgraded equalizer would be appropriate for your setup.

expert reply by: Robin H

Dennis

3/24/2024

I have the 2670mk camper. I have the 4 point sway bar setup. The jiggling is front to back.

Dennis M.

4/1/2024

I did not receive a reply to my last email giving you the info you requested. Thank you Dennis

Robin H.

4/1/2024

@DennisM I'm sorry about that, our comments weren't coming through for a while so this was lost. I'm not sure what year you have but if it is at least the 2022-2024 then I would add the Dexter E-Z Flex Suspension Kit # K71-653-00. This will help to absorb some of that front to back force and reduce what you're experiencing. It also comes with upgraded shackle straps that match your 2-1/4" shackles and wet bolts. Also, since you have a weight distribution system already I would make sure that your loaded tongue weight isn't sitting at the max or above the max tongue weight range of the system. Ideally you want it in the middle of the range. If it is outside of the range of the system it won't be effective so it would not help to mitigate trailer movement.

Dennis M.

4/1/2024

@RobinH , the front to back jiggling occured on our way home from the camper dealership with and empty trailer and empty truck. What do you meant by, "weight range of the system"? Thank you Dennis

Robin H.

4/1/2024

@DennisM all weight distribution hitches have certain tongue weight ratings. For example, the Equal-i-zer # EQ37101ET is rated for 600-1,000 lbs of tongue weight. If this was the system you had it would likely be appropriate. Assuming you have a 2024 it looks like your unloaded tongue weight is 690 lbs and your max would be something like 850-900 lbs of tongue weight which means it falls within the tongue weight range of the system whether you're fully loaded or have nothing in it. I'm going to guess the dealer didn't tell you anything about the system they installed so it would be worth asking to double check. If it is underrated it won't be effective. If it is overrated it could cause you problems and a rough ride. Also, I would add in everything you plan to carry before testing it out again. Loading in the gear you plan to take will likely help with the porpoising since it won't be as light. It could be that right now there is a lot of weight in the front or back throwing it off and allowing that motion when you hit bumps. Make sure to keep weight evenly distributed if you can.