Wd62n rocking side to side - Hotpoint Aquarius WD640 Front Load Washer/Dryer

By 'side to side' I'm assuming you mean it's rocking left to right and not front to back? The most common direction it will rock will be on a diagonal line. How far is it rocking? A small amount or a large amount? Small amounts can be adjusted. If it has recently started rocking badly, especially on high spin, it might suggest there is another issue that needs looking at.
Most machines only have adjusters on the front. Wind both feet all the way In then wind them both Out again 5 full turns. You might need a helper for this as you will need to tilt the machine to take the weight off the feet. Physically push and pull the machine to see which direction it is rocking. It will always rock on the highest points. On the corner that lifts wind that foot Out half a turn and the other foot In half a turn. Repeat this using Half or Quarter turns until the machine levels out. If the rocking direction changes sides wind the foot you have just wound Out back In the half/ quarter turn you have just used but Not the other foot.
You might need to 'fine tune' with more eighth and quarter turns over the next few times you use the machine. At this point you only need to adjust the foot that actually lifts off the floor.
If it rocks evenly down the centre line of the machine it might be the actual floor causing the issue.

First, you have to know what a strike is. Picture a flat rock laying on the level ground. Tilt it. The strike is the direction of the rock related to the level ground. The small angle between the rock and the level ground is called the dip.

Now, rocks are often in layers. When that layer is at a tilt to the horizontal plane, that is a strike. It is a tilt but it is underground in this image.

Now, go back up to the first description of strike, the rock tilted against the flat earth. If you had a mirror image of it on the other side, it would form a V. If earth were piled underneath the wings of that V, and each wing was hundred of feet high, you would be looking at a strike valley. The sides of such a valley are layers of rock tilted at an angle to the horizontal (flat) earth. Geologist describe the valley as being parallel to the strike.

Add more rock.

Seriously.

Rock has an "angle of repose", the angle at which it forms its own natural slope. If you pour sugar into a little pile, you can see sugar's angle of repose as the angle of the pile's sides. Rock is the same, but has its own angle of repose. If rock is sliding off your plastic, it's not built up enough yet to maintain its angle of repose, so you have to add more rock to get it to that state... after which it should stay stable.

There are many reasons that this could be noisy...

When you turn the drum (quickly) when it's empty does it rumble? Bearings, drum support or motor bearings.

If it sounds like a pneumatic drill when filled and spinning it could be drum support, bearings, balance weight or suspension.

These are not an exhaustive list but the usual suspects.

Hello. You should try the odd number. And you should try the other closed side first, then the head rock second. Good Luck.

Pretty good sign the belt is broken.

Yes, its the suspension. You are rocking on the springs alone...v. dangerous!

I would need more info to picture what is happening with the rocking else I may mislead you. Are there any other symptoms that occur when it rocks (does it thump, squeak or grind etc.. when it rocks)? How hard does it rock?

Concerning your lifters you could try an engine additive that restores lifters depending on the severity of the problem. A backyard mechanic may charge $100-200. An auto shop obviously would charge more. The whole top of the motor would have to be removed to get to them. It can be done in about a day to a day and a half.

the rocking is normal play, replace the switch

Go to an alignment shop. Sounds like tierod ends or ball joints. They will yank on them before an alignment to check play. Do not wait too long.