I own a Palomino hardside and the only thing I do not like about it is the bi-fold design of the walls. Each wall is attached to the roof and to the camper body, and each wall is hinged in the middle so that the middle of the walls folds inward. That design requires a set of windows above the hinge and another below the hinge, making for a limited view outside. It's claustrophobic compared to . It also makes the walls heavy, and since the roof has to lift the walls as it rises, it makes raising the roof more challenging (requiring two beefy counterweight springs on each end in my 80's era popup).
I like the hard sides from a security perspective; when working properly the camper is very stable. But I don't like the weight, complexity, and restricted view of the bi-fold design. So while I am rebuilding my roof now I am using the opportunity to replace the walls.
The new walls will be one piece, attached/hinged at the bottom only. The roof will be raised, then the side walls will be lifted up and clamped to the roof, then the end walls/slideouts (still canvas) will be extended per usual. I'm using new windows (basement storm windows from home depot actually) and the walls will be a sandwich of FRP on the outside over a wooden frame & foam, with wood paneling on the inside.
I am extending the outside of the roof's sidewalls about two inches with aluminum plate or FRP. That will provide coverage over any gap there may be between the walls and the roof so that wind and rain cannot penetrate where the wall and roof meet. The lower end of the walls seals with a rubber strip now and I will continue that. I will have to design the walls carefully so they meet the roof with minimal gap. I will use two draw-tight latches on each side to connect the sides with the roof.
The roof will be much lighter without having to pull the walls up with it, and I'll have real windows (36x24, 3-4 per side) and a better view. Assuming it all works I will post photos when done.
If you go from canvas to hard walls you will gain a bit of weight and lose the expansive view you are probably used to, but you will gain a more rigid structure and have a little less canvas to bother with at setup. Good luck with your decision, and post photos when you are done.