We just went through a similar process! We also needed to be able to sleep a lot of people with our family of 6 and often an extra kid or two, none of which are shrinking in size.
What I did was start on the Forest River website. I pretty much looked at every floor plan they make in a TT. Usually if the model has 'BH' in it, there are bunk beds.
Once I had it narrowed down based on floorplan and weight, I then did some basic 'google' searches and found dealer's websites where they had actual pictures of a unit. That helped a lot to visualize what the floorplan actually looks like in 'real' life.
Finally we compared all that to what was available through our local dealer and found the perfect unit for us. We have a little more towing capacity so went with the V-Lite 30WTBS, as it has 4 almost 'normal' sized bunks in the "V" and a queen bedroom in the back. It also has two full sized air mattresses that work on the dinette and sofa for full sleeping capacity of 10.
Here's a couple of possibility for you:
Flagstaff Towables Lite Travel Trailer by Forest River
Flagstaff Towables Lite Travel Trailer by Forest River
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2012 Flagstaff V-lite 30 WTBS
2011 Ford Expedition
4 kids and a hubby & never enough time to camp!
2011: 17 nights 2012: 26 nights 2013: 46 2014: 20 2015: 16