First welcome to the website! I have been boating for alittle 30 years and each time I have moved up in size with a bigger boat it has always been a period of adjustment but it has all worked out for the best.
Another question you haven't asked yourself is this boat going to work out on your favorite body of water? I can remember back in the late 80's when I bought my first brand new boat, I went from a 18 foot to a 21 foot because I was tried of being bounced around. It did help alittle. This was boating on the Lake of the Ozarks too. I can remember having this boat and trailer sitting in my driveway and wondering if I had made the right decision like your doing.
The room issue is valid! You want enough room in the boat for all your stuff........Your vehicle is more than enough to tow.Your husband will get used to towing it.
Just wait until your kids are all grown up, that will be a big boating change for you. That is when I decided on a weekender type boat.A 26 cabin crusier, then moving up to what we have now which is a 2001 3000 scr which I do have a trailer but not a vehicle to pull it with. My point with all this is that things change......you and your husband might get tired of all this or your kids get other interests.....who knows.
Make sure you get a survey done on this boat or atleast a mechanic friend to look at all the fluids. The trailer should have brakes on both axles and ask when the bearing have been looked at. A trial run with your surveyor on board should be mandatory also before you buy.
Yes as I said before there will be a time of adjustment or to get use to your new boat but that is what an adventure is all about......have fun!