Terryallen makes a very good point. Our 10' box PUP slept 4 adults and 2 small kids; our HTT slept 4 adults and 3-4 small kids. Our 34' TT sleeps 4 adults, period.
Have you considered keeping your PUP and getting a separate tent for the kids? Or getting a new, bigger PUP? They make some these days with space from bumpouts, showers, and all kinds of amenities.
We started out with an 11' slide-in camper, then 18', 27' 29' & 32' TT's. The 32' TT was actually nearly 35'. Then after a 37' DP, we're back to what works best for us, a 29' TT. Generally, we try to go with the smallest RV (or boat) that will do what we NEED it to do. 'Wants' gets a lot of us into trouble.
Steve & C. J.
"Gracie" the Rough Collie & "Bo'sun" the Bichon Frise
Didn't think length matter anymore. I have a 16 foot funfinder for two people. I would not even dream of having anything longer. I have the entire out doors for my living room. I have a table out side for cooking inside I have a full bathroom, even if I do have to sit on the toliet to take a shower, and if I am brave I can take it out side. Get what you want and never ask "what size" that is why you can buy anything for a 10 foot "Teardrop" to a 40 footer.
As you can see from my signature, my TT is a 30 ft bunk house. With four kids I would not want it any smaller. I have never had a problem getting it into and manuvering it where I wanted to.
2003 Coachmen Catalina 300 TBS
2003 Ford F350, 5.4L, 3.73
Husky 1000 WD
Prodigy BC
Wife, Four Children (17, 13, 12, 6)
Two Labradors
We had a 12 foot popup for a few years -- it was nice for sleeping w/ two king beds but there was not much living space. Expanded, it was 24 feet but fit most anywhere.
When it came time to dump the canvas and acquire more space to accommodate our family of four in comfort (dedicated beds, dinette, sofa etc.) the only TT's that seemed to offer everything were 30 footers. We bought one and enjoyed it for three years, but we did have to pay attention to length when making reservations. It wasn't all that difficult to back into large sites (especially with a short wheelbased TV) but you always had to prepared for problems when booking more private back-in sites -- no so much a problem with less private pull-throughs. Our 30 footer would not fit in older National Parks that were strictly limited to 27 footers which where considered huge decades ago when they were developed.
Since our kids are older and don't come camping with us as much we recently downsized to 25 footer and absolutely love it. With no slides there's almost no site we can't fit on. In fact I'm seriously thinking of investing in a generator and foregoing the hassle of reservations. The best sites are often dry (no electricity) anyway.
As an aside, if the kids are young and require dedicated sleeping so they can go to bed early and have their place to play, 30+ footers with the extra space really can't be beat. But if the kids are older and retire with mom and dad, don't discount the simplicity of a shorter, more compact unit. Even though ours is only 25 foot with no slide, we can easily and comfortably sleep our family of four when needed -- and it fits practically anywhere.
Cheers!
Gary
2001 Airstream Safari 25SS tugged by 2001 GMC Yukon 5.3L 3.73
Hensley Arrow • Jordan Ultima • Barker 3000 • Mckesh
I have a 33' travel trailer and there are some sites that I know that I couldn't get into. However, our camping changed from mainly state parks to mainly parks with pools when we had our daughter, she LOVE to swim.
If you get any sized trailer it will limit where you can park in the NP/SP's, some are only tent sites Sometimes you won't be able to get in because of height, sometimes length and sometimes the roads are so tight that you can't swing enough to back in
Jeff
2009 Rockwood Signature Ultra Light 8317SS
2004 Dodge Ram 1500 QC LB Hemi
DW Kelly and DD
Online
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Sometimes you won't be able to get in because of height, sometimes length and sometimes the roads are so tight that you can't swing enough to back in 
