I haven't heard too many negative reviews or complaints about Axel Bloom although we've never had one. If still, RVing, we'd definitely look into it as we now require an adjustable bed.
They don't seem horrendously heavy from what I can tell ...it's how the bed is configured in the slide I'd imagine could pose some problems.
Have you looked through the client installation and testimonials on the Axel Bloom blog?
Client Profiles - Blog
This one is quite recent and caught my eye as that is a similar coach (a short Winnebago gasser) our friends have who installed an Axel Bloom.
Adjustable bed for 2018 Winnebago 27PE
Not a whole lot of prior threads on Axel Bloom here but I was able to find three:
Axel Bloom Bed Frame and Mattress
Axel bloom adjustable bed information
Custom Bed