Modular LP record storage suggestions

After a recent move I am sitting in my new home with about 30 book & record boxes sitting in my garage, wanting to come inside. I figure to pare them out once I can get them out and keep perhaps 1/3 of what's out there. That might be about 1,000 albums or so. I've got a 6' long wall unused in a bedroom to place storage. I would want something up to about 6' in height.  That's a lot of weight. In my old home I had steel-and-wire shelving that's inexpensive but inefficient insofar as there's little side support. I also had some of the old popular IKEA units that were efficient and heavy, but their new Kallix units look insubstantial to me. So I've come to the source where many of you surely have faced the same deal.  All the interior bookcases I've found look too shaky for this. Otherwise, garage units (this doesn't have to be pretty!) are supportive enough, although usually too deep (24"). Most I've found also either have non-flat shelf surfaces and/or lack any kind of side support, on the ends or in the middle. The vertical supports between albums are the hardest thing to find. It would be nice if there were some sort of modular shelving, especially if it were narrow, like 3 feet or so, that you could put side by side. I'm open to ideas here, obviously. Having someone come in and build me a bookcase heavy enough for this seems very expensive. Garage type units would be much cheaper and just as good (and easier).