A couple things to consider...
The dry weights are misleading. Don't believe them. Everything adds to that weight... battery, propane tanks, sometimes spare tire, sheets, clothing, food, chairs, etc.
Your PAYLOAD will oftentimes be the weakest link. Many suggest that you load up your truck with gear like you would to camp, including a full tank of gas and the whole family and take it across a CAT scale. Then subtract your total weight from the GVWR and that will give you your AVAILABLE PAYLOAD. You might be surprised how little payload you have available to you to tow.
Once you know your available payload, you need to find a camper with a WET/LOADED TONGUE weight that will be less than your available payload. Remember that you will need a weight distribution hitch (WDH) and they usually weight 50+ lbs too.
Once you know your payload weights, you will be able to narrow down campers that you like.
I'll be honest with you, sometimes the best camper is a popup camper. Low profile means better towing mileage. Usually available with 2 king beds and a dinette that folds into a bed. Decent interior space so you aren't bumping into each other. Downfalls are that they usually don't have a bathroom, can be louder when camping (like tent camping) and involve more work putting up and breaking down.
Either way you go, I would recommend you start with a USED camper first. You will inevitably find things that you HATE about certain style campers, things you NEED TO HAVE in a camper, etc. If you are taking longer trips you need to be prepared for bad weather. A standard 26 foot bunkhouse will have minimal interior room for mom, dad and two boys to spend the entire day crammed inside. A slide will give much more room to spread out when crammed inside. You might find that it is difficult to cook inside. My family likes taco's and spaghetti when camping. Both are easy to cook and provide leftovers for lunch the next day. Unfortunately, both leave lingering cooking odors inside the camper. As a result, we are strongly considering an outdoor kitchen for our next camper.
Look at a lot of campers. If you find one you like, try to spend an hour with the entire family inside and see how it feels. Buy within your tow vehicles limits, but try to maximize the space.
We bought our current trailer when it was the bride and I. It was snug, but manageable for the two of us. We have a 23 month old daughter and a little boy on the way now. The camper is suddenly too small. When it rains, we can't sit out under the awning and watch the storm anymore. The daughter won't sit still that long. That leads us inside during stormy weather cause its easier to wrangle her. Space is tight and two of us can't walk past each other w/o the slide. New camper will have a slide, a TV, and decent size slides in a separate bedroom.
