Note that the OP says they don't want a bunkhouse, but something smaller and easier to tow. I generally disagree that a 30+ foot whatever and a 350 tow vehicle is absolutely required, so will continue to have that opinion here.
A family with 6 children already knows that there are sometimes extra challenges. I don't see why a 3 bunk HTT wouldn't work....with some limitations. Without knowing gender and ages, let's assume that a couple of the kids will be thrilled to have their own tent right next to the HTT and have their own space. If they're still at a younger age, the dinette or sofa is the choice OR put 3 kids per bunk. Strict limitations on what you can pack. Get something like the storage crates or smaller laundry baskets for each. That is what you can take. No more, other than a heavy coat when the weather dictates. If you plan on taking bikes, that really throws a monkey wrench into things. Problem.
Assume you already know that you're going to have to be extra careful with weights. Unless you dry camp without any water hookups nearby, you certainly do not need to carry water with you. Empty tanks gives you less weight, which is what you need.
I would suggest that you take an online look at RV Wholesalers in Lakeview, OH. They carry the ROO line and have descriptions, pix and sometimes videos for each. If you see something that looks good, they will email you the price, but it's generally close to 30% off MSRP, which is shown. Both our HTT and our new TT came from RVW and we saved over $4000 over our local guy on the HTT and more on the TT. You could turn delivery into a mini-vacation or, my personal choice, leave the kids with friends/relatives and turn it into a mom & dad get-away. Even with travel costs, you'll come out $$$ ahead. If you prefer a local dealer, you have the numbers from RVW as a negotiating tool.
RVDirect does carry Jayco. The reference to the Jayco clearance is that they generally have a lower profile and many have had problems getting in and out of driveways, parking lots, campgrounds. May be a problem for you, maybe not. If you think you might like the Jayco, spend some online time with RVDirect. Both are good, reputable dealers with many here as satisfied customers.
First step, if you haven't already done so, is to absolutely confirm the towing specs on your vehicle and be sure you are in safe limits and have about 1000# to spare. Good luck. Hope this will work out for you.
Note: Just remembered that the MO SPs that we've been to do not have water to the site, but do have several locations where you can fill your fresh water tank. Invest in a blue tote to dump and a white water jug for refilling + some extra lengths of fresh water quality hose.
Trailerless but still have the spirit
2013 Rockwood Ultra Lite 2604 - new family
2007 Rockwood ROO HTT - new family
2003 Ford F-150
4 doggies - We support Adopt/Rescue.
Sam, you were the best!
Cubbie, Foxy, Biscuit and Lily - all rescues!