Looking at a gulf stream conquest 255 with slide out and a 25lx heartland prowler no slide out. Rest of the features are about the same. Price the same. It's me my wife 2 girls 7 & 10. Plus two big do...
With kids AND dogs, I'd go for the slide. We have dual slides on a current trailer and it's great for 3 dogs because it gives them lots of floor space. I don't think I'd ever own a trailer that didn't have slides. Knock on wood, but I haven't had a problem with slides on 2 trailers over the last 9 years. The extra space is well worth it in my opinion.