Slides - how long is too long?

The larger the slide the more prone to issues for the most part. You are talking about a large section of living space which is very heavy sliding in an out with precision. The larger the slide, the heavier, not only form a coach perspective but from a “what can the slide motors and rails handle” perspective too. Typically they are the same motors as small slides. The larger the slide the greater the risk of it not going in perfect unison especially if you are not perfectly level. And the larger the slide the larger the bills will be to fix it if not under warranty. My friends have a new Thor Palazzo 36.1 which has a full wall slide. You are literally talking about one entire side of the coach, with washer dryer, oven couch etc, sliding in an out on motors. Turns out the motors are underpowered for the task if your voltage drops even a little. Months trying to get that fixed and no way are you manually pushing that beast back in if the motors fail. They also said due to the weight it leans to one side. The solution from Thor was to add 800 lbs of weight to even it out and adjust PSI. Not a solution if you ask me. Thor isn’t the only one with full slide woes either since most use one of 2 brands of slide mechanism. Quality control is nonexistent in the RV world unless you spend big bucks (even then it’s questionable). Full wall slides are risky from what I have seen. But I wouldn’t be without slides. I just would steer clear of full wall ones. Never had an issue with either of our coaches and their slides. This is my personal opinion of course.