I believe that this was a made for TV movie, probably from the late '70s or early '80s. One scene has been stuck in my mind since, for unknown reasons, it terrified me as a kid.
In this scene, the character is in some sort of trailer workshop. He's been working on a powered exoskeleton suit that will enable him to walk. It is not a metal bars/springs/motors exoskeleton as some of the real "power assist" exoskeletons being made today are. It's more like a NASA space suit in hard, red plastic. I don't recall if there was a helmet, but I'm pretty sure that it was a full upper body/arms suit. He opens the back door of the trailer (I believe it's a ramp door like you'd use on a vehicle trailer) and walks out.
That's really all I remember of the show. I recall watching it with my Dad, and we didn't go to a lot of movies, so I'm pretty certain it was made for TV. However, it could have been shown in theaters and this was a TV cut of it.
I remember nothing of the rest of the movie. I'm reasonably certain that the making of this suit was at least one of the major themes of the show, though I don't know if it was the main plot point.