I'm completely renovating our bathroom, which includes
moving the washer/dryer and stacking them. It's the physical
installation part that's making me a little nervous...

These are full size front-loading machines intended to be stacked.
We have the stacking kit.

The intent is to build a platform about 4" high in a corner
of the room, with a 12" wide wall to hide the back of the
installed units. Which means that, when installed, there will
be one and two thirds of the sides of the units accessible -
the front, and 2/3 of one side.

If the washer is set on the platform, there is no way we can get the
dryer on top of the washer and bolt the mounting kit (on the back).

Just the thought of lifting the dryer that high...

Assuming two reasonably sturdy adults, how do people do this?

Are there ways to put a stacking system on top of a roller stand?
[Eg: make the platform movable in some way]

While this will be directly over the foundation end of the
joists, the vibration in operation is going to be pretty strong,
and I don't want the unit walking out into the floor or swaying
so much it whacks into the walls. It has to be securable. Or the
wheels removable after placement and bolt-down. Or something.

I'm going to make the platform _very_ sturdy - eg: double layer
of 3/4" ply on top of 2x4 "sleepers" laid flat, ultimately secured
directly to the floor if not the floor joists themselves.

Any thoughts or comments would be appreciated.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.