Actually, I would say yes. As the manufacturers built, larger RV's the customer got larger dinette tables, larger toilet, larger holding tanks, and more room to move around. I would NOT recommend a 26-foot for 6-8 people.
Be aware though that most campground limit the number of people allowed on a campsite to 6.
Also, always check whether it is allowed or not, but many campgrounds will allow you to add a small tent where you can have a couple of people sleep at night.