Do you think the trailer rides smoother ?
Before I put the Roadmaster slipper springs and shocks on my trailer, I had the Summo springs on it. Yes, it does smooth out the trailer by a good amount. The trailer didn't bounce around as much, felt more stable, and less things moving around on the inside. I liked them, and they were easy to install.

A side benefit to them was when both the shackle bolts broke and the leaf spring was not attached, and another time when a leaf spring broke, the Summo took up the full load, and the only way I knew something was wrong, was the trailer was tracking slightly sideways. I am in firm belief that they prevented some damage to the trailer.
 
Do you think the trailer rides smoother ?
I've never been one to really tell if the trailer rides smoother... And I installed them the first season so they have been on four seasons...so I kinda forget what it was like without them. But when we go over poor bridge transitions, like I35 in Iowa!, the trailer rides it like a champ. Without the Sumo's or shocks the trailer would oscillate side to side quite a bit. Bringing the trailer home after purchase and hitting poor pavement and bridge transitions is why I bought them. They are not the same as a shock, but sort of similar, they dampen compression, but not rebound. So to smooth out smallish road irregularities, shocks are probably a better choice. To reduce sway, I think the Sumo's are a better choice.

As to Iowa's I35 bridge transitions. I think they finished the bridge 6 to 8" too high. So they got some dudes with a half ton and had them throw some cold mix asphalt at the difference.
 
When going over road/bridge expansions and I look in the side view mirror the trailer stays flat. No bouncing afterwards. Yes I get the side to side tilt but it's really smooth over bumps. Like going over offsets in the pavement at a slow pace I can feel them in the truck but not when the trailer tires go over them. Only on the worst of the worst roads do things move. I'm talking about large road undulations along with me going to fast. Once in a while I get caught off guard and don't slow down soon enough.
The Oregon coast hwy 101 has some nasty spots that will move the recliners a bit.
In general the trailer stays smooth with no bouncing over normal road conditions.
We have a cutting board that sits on the counter with some of that drawer liner under it. It's been there for 6 seasons and around 19,000 miles.
Until someone can explain to me why a truck with leafs needs them but a trailer with leafs doesn't them then I'll keep buying trailers with them or install them afterwards.
@goducks14
I think you hit the nail on the head. For me that is the same tell-tale that things are smoother - don't feel the trailer go over railroad tracks, bumps, etc. Of course, bad roads always produce a bad ride, and every road seems to have a bad section sooner or later.

My guess as to why manufacturers don't install anything but leaf springs simple comes down to cost. Check out DRW; they put on MorRyde IS, but the price of their RVs reflect the upgrade along with others they include (including a special frame).
 
Odd, I never felt the trailer go over expansions joint or RR tracks but there has to be some shock back there for the heavy iron grate on the stove top to pop off and land on the floor. I wondered if the bladder in the goosebox masks some of the trailer jolts in the truck.
 
Odd, I never felt the trailer go over expansions joint or RR tracks but there has to be some shock back there for the heavy iron grate on the stove top to pop off and land on the floor. I wondered if the bladder in the goosebox masks some of the trailer jolts in the truck.
fwiw.... I try to keep my gooseneck bladder on the low side and keep the air bags in the truck on the higher side. For me that seems to be the best arrangement. It has take a while to get this "dialed in' but I think, for now, this is my best set up.

This stuff is so personal and judgmental. Everyone has to find their own comfort zone. My silly logic is the bag picks up any small undulations and the truck takes care of the larger ones. Pretty goofy, I know - like I said: so many variations and each has to discover what works for them through trial and error.
 

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