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Old 11-29-2015, 06:44 PM   #1
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How Long Do They Last, Safe T Plus Steering Units

Hi Everyone,

We are still working the bugs out of our new to us 1997 32' Tiffin Allegro Bus DP.
The current issue is the tendency to wander down the highway, at slow speeds under 45 MPH all seems ok. Once we reach highway speed of 60 mph, it takes quite a bit of correction to maintain the lane. Not quite a white knuckle ride, but close, as lane changes and tight maneuvers can be tricky.

MH has 38k miles and BIG aftermarket sway bars and a Safe T Plus unit installed.
Tires are brand new, approx 3k miles and have been inflated to the inflation table provided by the manufacturer for the loaded weight of the coach.
Alignment has been checked and we are running out of ideas.

Next on the replacement list is a new set of shocks, Koni or Bilstein, (insert your preference here).

Considering that the Safe T Plus is probably about 16-18 years old, is it time to replace the unit as a starting point and move on from there?

How long do these units last or continue to perform their function?

Any additional ideas to Tame the Beast are welcome.

Thank You,


J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
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Old 11-29-2015, 08:06 PM   #2
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Prior to 2009 Saft T Plus units had a 2 year warranty and now they have a limited life time warranty. You can send it back to the factory at Decature, GA at your expense to have it checked out. They say they have a 24 hour turnaround.

Model #41-230 | Safe-T-Plus - The Steering Control Specialists

Good Luck,

Jon & Sue Francis (Retired U.S.A.F.)
Lil Girl-Rescued, Abby Rescued, Peaches Rescued
06 Allegro 35TSA Workhorse Chassis
2013 Chevy Spark Dinghy
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Old 11-29-2015, 08:24 PM   #3
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. . .If shocks are on your list I vote for KONI!!!. . .
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Old 11-29-2015, 08:26 PM   #4
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My guess is the Safe-T-Plus is fine. I would venture to suggest that your front tire pressure may be too high if set to manufacturer max specs which can often have the RV wandering enough that you must continuously correct the steering creating fatigue. I've experienced this on two coaches. The correct solution is to weigh all four corners and adjust tire pressure accordingly.

On my previous coach I did mine by trial and error meaning I lowered the front tire pressure down 5 PSI at a time until it tracked nicely My sweet spot was 100PSI instead of the specified 110PSI. At 110psi the coach wandered almost constantly.

Again, the proper way is the weigh all corners to be sure.

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Old 11-29-2015, 09:08 PM   #5
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Hi Jupiter,

Thanks for the response, have weighed the coach and have the front air pressure at 79 PSI.
Recommended manufacture pressure + 5% per weight and Firestone inflation tables.
When the new tires were installed, they set the pressure at 110 PSI.
Now that was a wild ride, got to a location and dropped them to 90 PSI and it helped a lot. Once we got her home and weighed, we found the proper PSI.
I hear some coach owners complain about how their MH drives, others say that they can one hand down the highway. Reviewing the archives, it appears that many factors influence how they track. So far IRV2 has never let me down, and I guess I'm looking for that one owner that has the answer.
For now, I have my fingers crossed he or she reads this post.


J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
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Old 11-30-2015, 06:05 AM   #6
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Definitely validate the front tire pressure vs the actual weight on the axle - it can make a big difference and RV & tire shop techs often put in way too much pressure for the load.

I also suggest installing a track bar on the chassis, either the Davis Tru-Trak up front or a Supersteer Trrack Bar on the back. That will substantially reduce sideplay in the spring suspension that produces much of the wander. The Safe-T-Plus doesn't really do much for wandering.

You may find my article on Motorhome Handling Problems helpful - it's in the FILES section at iRV2 Forums - Files - Motorhome Handling Problems & Solutions
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 11-30-2015, 07:58 AM   #7
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Shorter wheelbase coaches often do not track as well as the longer wheelbase coaches. You did not say what brand of tire you chose. Some tires track better than others. If you are really stuck there may be a shop close to you like Henderson that specializes in ride quality. If you are on the original shocks then a set of koni fsd will help.

I use a blue ox true center because it is adjustable by the driver. My coach handles very differently over 50 mph. If I have been running at 40 to 50 for a while I need to readjust the true center as I get to my normal speed of 65.
2007 Fleetwood Bounder 38V
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Old 11-30-2015, 08:04 AM   #8
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Take a look at your bell crank. They were not serviceable and are sticky. The new are serviceable grease zert.

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Old 11-30-2015, 08:24 AM   #9
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Try first to determine if the wander comes from the front or the rear.
If the rig swings when a truck approches the rear, then check if you already have a Trackbar. If not,have one installed. Check for the tread on the homemade one: Cheap & efficient

Otherwise, check the leaf springs and the shocks.
Good luck.
2013 Vista 26HE, CHF (F&R), Rear homemade Trackbar, still looking for the best suspension
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Old 11-30-2015, 10:43 AM   #10
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You can add the Henderson Trim Adjust to the Safe-t-Plus and have the same performance as the Blue Ox Truecenter. I have it and it does make a difference. See:Hydraulic Steering Control - SuperSteer Trim Unit for Safe-T-Plus
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Old 11-30-2015, 05:04 PM   #11
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Originally Posted by hooptie00 View Post
Hi Everyone,

Considering that the Safe T Plus is probably about 16-18 years old, is it time to replace the unit as a starting point and move on from there?

How long do these units last or continue to perform their function?

Thank You,

I have a safety plus and it has well over 100,000 miles on it. I moved it from a previous RV to this one. I don't think they go bad often. I'd think you could check it by raising the front wheels off the ground then turning the steering wheel all the way to the right (or left). When you let loose of the steering wheel it should return to center. If not I'd think it was bad. Do it from both left and right full turns. Just my opinion.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
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Old 11-30-2015, 08:38 PM   #12
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I have owned the same allegro bus that you have, I also fought with steering, handling problems. I tried several things including the safety steer. Here are the things that helped with mine.

I removed the safety plus. Steering response was better without it.
Weigh the front end, mine was really light in the front, I assume yours is the same. tire pressure charts say I should only have 70 psi, tire pressure for the front end makes a big difference, I also added a 500# weight to the front end.
This made the coach drive completely different.

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Old 11-30-2015, 09:42 PM   #13
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Steering Tips and Tricks

Hi Badtip,

When I purchased the tires back in August, I had the coach weighed and looked up the inflation tables provided by Firestone for the FS561 model.
I posted a question here on IRV2 to double check and make sure that I had the pressures correct. Most of the responses found it hard to believe that 70 PSI was correct for a Class A coach and recommended a pressure about 75 PSI plus a 5% cushion. Hence my current pressure of 79 PSI. I will take your advice and drop them down to 70 PSI and see if it makes a difference.

If all is well, I can bump them up to 73 PSI and see if that is a take away in handling. Really want at least a couple of extra pounds if it will take it.

Have a 300 mile round trip this weekend so that should be a good time to see the difference. If it still needs some work, I'll take off the Safe T Plus on the way home.

If that doesn't do the trick, I'll move on to some of the other suggestions members have provided.

Thanks for the help to all who responded. It seems to be a work in progress for some coaches and every little bit of information helps.

J. R. & Lisa
97 Tiffin 32 DP, Freightliner Chassis, Cummings 5.9 275HP ISB 24V.
It's Adventure Time
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Old 12-01-2015, 12:19 AM   #14
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I'd follow Ken's advice. If that is insufficient to solve the problem I would do the following in order: Have the ride height checked, replace the oem bell crank with one from Henderson's Line-Up Brake & RV Inc. (smoother steering), new shocks ((is the coach dipping on braking) Koni was good for the weight of my coach - 30,000 lbs actual, 32,000 max), your coach is probably lighter (est. 27,000 max) so Bilsteins might be the right choice for you), if you having side to side sway (Walmart Wobble) and problems with passing trucks I would add MCUs (Motion Control Units) again from Henderson's Line-Up Brake & RV Inc.. I have done all of these things (plus Ken's - I had 4 corner weight done at the Freightliner Custom Chassis Service Center in Gaffney, SC and they set the tire pressure according to the manufacture's (Michelin in my case) inflation tables for my tires and I went from white knuckles, dead arms at trip's end to one driving quite a bit and not having to concentrate on steering all the time. Mostly, it's almost like driving my car (Cadillax SRX), almost. Still have to watch the unexpected cross winds and the occasional passing truck. And I'm not dead tired at the end of the trip.

Travel well, travel safe,
2006 Tiffin Phaeton - 2011 Cadillac SRX
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