79 trillium 4500 'bucking' - Page 2 - Fiberglass RV

Thread Tools Search this Thread Display Modes
Old 12-19-2014, 03:10 PM   #15
Junior Member
Posts: 4
What about coupler?

Thanks all! I'm trying a bunch of these solutions. Will report back.

Also, the coupler is the original and is rusty and loose. I assume it should be a little loose so it can lock into place. But should I get that replaced? Could that cause this?


gomerthetrillium is offline   Reply With Quote
Old 12-19-2014, 03:57 PM   #16
Senior Member
Mike Magee's Avatar
Name: Michael
Trailer: Li'l Hauley
Posts: 5,391
Once it's locked onto the ball, it shouldn't be loose. There may be an adjustment on it. If not (or if it's too rusty to budge), a new one may be best.

How to prepare Tofu
Step 1: throw tofu in the trash
Step 2: grill some meat
Mike Magee is offline   Reply With Quote
Old 12-19-2014, 04:28 PM   #17
Senior Member
MC1's Avatar
Name: Wayne
Trailer: Nest fan, Airstream Sold
Posts: 1,995
I'm with Mike. Once you lock that coupler down it should be snug with no play.
MC1 is offline   Reply With Quote
Old 12-22-2014, 10:25 AM   #18
Senior Member
David Tilston's Avatar
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Posts: 5,564
Well, there often is some play between the receiver and the stinger. Which you can buy a clamp for.
David Tilston is offline   Reply With Quote
Old 12-22-2014, 10:38 AM   #19
Senior Member
Martins HeirCon's Avatar
Name: Glenn
Trailer: Trillium 1300
Posts: 451
...but all of those are symptoms, not the cause. Any setup will rattle a little when unweighted, such as over bumps. Get it level and weight biased to the front first.

Sent from my iPhone using Fiberglass RV
Martins HeirCon is offline   Reply With Quote
Old 12-22-2014, 03:33 PM   #20
Senior Member
Larry Tenhage's Avatar
Name: Larry & Joyce
Trailer: 1974 Trillium 1300
Fergus Ontario
Posts: 114
Is it possible that you're hooking up a 1 7/8" ball to a 2" receiver? I.E, is there too much play in the hitch? That would cause some rattling if not outright causing the trailer to detach itself.
Larry Tenhage is offline   Reply With Quote
Old 12-23-2014, 10:28 AM   #21
Name: Dale
Trailer: Trillium
Posts: 79
I pull my 4500 comfortably with a vw jetta, something funny is going on if you're getting that much bucking. I wouldn't jump straight to replacing axles tho, start with the cheap/easy stuff.

I'd go tow vehicle back,
1) is the receiver hitch tight on the tow vehicle? (i used to have one that would move making noises that sounded way worst than they should have)
2) is the ball the right size for the trailer?
3) is the coupler adjusted properly for the ball
4) do you have enough tongue weight? (mine pulls better with a battery and propane tanks mounted)
5) tire pressure? free to check
6) suspension condition
7) Frame condition
dbir is offline   Reply With Quote
Old 01-25-2015, 08:51 PM   #22
Senior Member
Name: Claire
Trailer: 1978 Trillium 4500
British Columbia
Posts: 261
One more point to add to Dales.
8. Is the Ball on tight.

We had a horrible first week towing in the cascades and discovered that our ball was coming loose. Tightened it up and no more bucking!
Island Claire is offline   Reply With Quote
Old 01-25-2015, 09:50 PM   #23
EcoHeliGuy's Avatar
Name: Walter
Trailer: Boler
British Columbia
Posts: 67
79 trillium 4500 'bucking'

Also your Jeep is a unibody. As a result any slop in the connection sounds really loud compared to an older body on frame. I always use a hitch clamp on a unibody.

Also tighten the coupler with the hitch removed from the tow vehicle. Clamp the coupler to the hitch, keep tightening the coupler nut until there is just enough friction on the ball it starts to resisted moving with hand pressure on the hitch. Then try the latch a couple times. If latch isn't working smoothly, very slightly loosen off the nut until the latch works every time. This is the perfect clamping force

But my money is on hitch hight and hitch weight.

Sent remotely
EcoHeliGuy is offline   Reply With Quote
Old 02-09-2015, 12:17 AM   #24
OscarD's Avatar
Name: Oscar
Trailer: Trillium 4500 Jubilee 1979
Posts: 56
My 1979 4500 original axle that was removed had 1200 stamped on it.
I believe the axle was minimal.
Bucking was always a problem; with LOTS of weight forward it lessened.
After installing the Timbren Axle-less Axle we've been on two trips and the trailer is not bucking. First noticed going over a rail track which would have had the trailer airborne before. Potholes did the same. It is safer now and I wish I had thrown out the 36 year old axle when it was "straightened".

This should link to the post.. Offroad best axle?
Offroad washboard best axle?
OscarD is offline   Reply With Quote
Old 02-09-2015, 08:33 AM   #25
Senior Member
David Tilston's Avatar
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Posts: 5,564
My 1978 4500 had 2000lbs stamped on it

David Tilston is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Scamp 5th wheel "bucking" on uneven surface ? Westcliffe01 Towing, Hitching, Axles and Running Gear 15 11-12-2013 10:29 PM
CA | For Sale: Trillium 4500, Santa Barbara. $4500 SOLD! tellis Classified Archives 7 09-04-2013 11:07 AM
AB (Canada) - Trillium 4500 - 1978 - $4500 David Tilston Referrals: Molded Fiberglass Trailers 16 04-22-2013 01:07 PM
"Bucking" feeling while towing in-town (trillium 1300/volvo 245) coalminecanary Towing, Hitching, Axles and Running Gear 12 10-18-2011 11:59 AM
1979 Trillium 4500 for sale -- C$5200 or US$4500 - SOLD jenniferm Classified Archives 8 07-14-2009 01:38 PM

» Trailer Showcase


Nate R


Myron Leski
» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:58 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.