Well, I'll chime in, but I've never installed them, I've just had campers with both kinds. My current 5er has them. Here's what I've found to be some of the pros and cons.
Traditional folding camper steps:
Pros:
1) When traveling, you can flip them down or open anywhere and they are immediately ready for use, even if the ground is horribly uneven. (Quick and easy.)
2) The dirt they pick up stays outside the camper, as they are folded up outside the camper.
Cons:
1) They are shaky and sometimes feel somewhat unstable.
2) In order to feel stable, you have to put a step jack under one of the steps.
3) All the weight on the step is supported at the trailer door where the steps are attached and the steps never touch the ground. They usually have weight limits and if the limit is exceeded, they can bend.
4) On my prior trailer the frame of the steps themselves actually cracked. Mine had 4 steps. That's a lot of leverage of the bottom step and with the wiggle it had, over time, like bending a wire over and over and over again, it cracked and broke. Because it was actually welded to the frame from the trailer and secondary screws into the door frame itself, I had to fabricate an L shaped brace to hook the whole thing back together again, which worked, but then going forward, I used one of those step RV supports under the middle step.
5) They are slick. So you have to add an RV step carpet wrap on each step, or get friction stick-ons.
6) They are painted black. They begin to rust. After a very short while they begin to look horribly dull. So, mine got spray painted with Black Rust-o-lium quite often.
7) Because they are black, at night, if you don't have outside lights on, they are very hard to see, you can miss a step and fall.
Mor/ryde steps:
Cons:
1) In order to use the, you have to open the door all the way to pull them down. If the door is not swung back completely, they hit the door.
2) When setting them up, the feet have to be adjusted every time you are at a new location. So, if traveling and you need to stop along the edge of the road, you have to open the door first, pull down the steps, and then they may not touch the ground. Each support leg has to be adjusted before you can step on them.
3) If the outside ground is too low, you have to put blocks under the steps so they have something solid to rest on. You absolutely cannot use them if they are not touching the ground on something solid.
4) If the ground is too high, you can't adjust them any shorter. What happens, they are not completely "down", so where the steps lap over the threshold of the door, if that is not completely flat, you can't shut the door. (I've not run into this yet, but it is possible).... But I have had the feet adjusted too high and found the door will not shut as the bottom of the door will hit the step frame.
5) If you don't sweep the steps off when you put them back up, the dirt will come inside the camper.
6) In my case, my 5er is pretty tall. The door handle is also pretty tall from the ground. Considering the door has to be opened first, before the steps can come down, if traveling and you need to stop, and you are on the side of the road, and you are along a ditch, you might not be able to reach the door handle to open the door. Where as the folding traditional steps could have been just pulled out, you can then step on the steps, and you can reach the door latch. This has never happened to me, but we have stopped on the side of the road several times where I really had to reach to get the door open. If you are tall, this may not be a problem. If you are short, it can be a problem.
Pros:
1) They are VERY solid and can hold an incredible amount of weight. My wife and I both stood on ours at the same time. She was on the bottom step, I was on the top, and the thing never gave an pinch. Rock solid!
2) They are silver colored aluminum, much easier to see at night.
3) They fold inside the door of the trailer, making it harder for kids or thieves to fool around with your camper, also makes it harder to reach the door handle if they are "in" (depending on where you are parked). This is actually a good thing. Ours is so high and with no steps, a thief wanting to break in through the door would have a hard time just reaching the door.
4) Although both feet have adjustments so they can reach the ground, even on uneven ground, they are pretty easy to adjust them. If you are camped at a permanent site for a while and you put the steps up every time you leave, you don't need to adjust them each time. They really are nice!
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So, if you ask me which do I like better? Well, I can honestly say, 100%, I like the Mor/ryde better.