So the trailer is for you and your husband...
At 6'4" he is what we consider "height challenged" in the molded fiberglass
egg world. There are only a few that will give him full stand-up headroom and/or full stretch-out sleeping space. By most accounts sleeping space is more important. One solution that might work in a small trailer with two sleeping areas (like Bolers, Trilliums, Scamps, and similar) is to give him the double bed to sleep diagonally, and you take the other bed. Another solution is to look for a layout that has one end of the bed open so his feet can hang out or you can add a little extension (like the gaucho bed in the older Bigfoot
17G and a few other similar layouts).
Actually a Bigfoot
17G might be just the ticket. Between the front dinette and the rear gaucho, you could squeeze all seven of you inside for a meal on a rainy day if it came down to it. And it has a bit more headroom, too.
I think you'll just have to take this on a case-by-case basis. Follow up on some ads, lie down in some trailers, and see what you think. As earlier posts reveal, everyone has different levels of tolerance for tight spaces. My wife is only 5'1", and she thinks the "double" bed in our Scamp
is exactly the right size... for herself!