You mean the 240BH
When you say growing family...I'm going to assume one kid now and maybe another one in the future. ? The ST 240BH would give the adults their own bed and hide-a-way. I like the TV that turns all the way around to face the main living area or just the bedroom. When looking at floorplans, you really have to sit down and close your eyes for a minute to visualize how you will use the space. Like: when its rain, or the campground has a crappy shower facilities do we have enough room for showers, long trips you will want to pack extra stuff.
As far as weight of 5100 dry, I think you will be fine. So your looking at maybe 6100 tops....I think with a slide especially if two kids are in the mix, days when your cooped up inside because of bad weather you will have more options to play board games, watch TV or video's....
We have 25' hybrid which gives us a couch also. So on rainy days I'll claim the couch and my wife and son will get each end of the pit dinette. Just one note
: Our old 2005 had a regular two seat dinette like that 190
model, our new 2013 has a "pit or wrap-a-round dinette like the 240
model. The table area is a about 3" shorter in the new RV, but we find we have tons more elbow room....but if we had two kids and they were teenagers the table eating area would be a little tight as far as table space. Here is a pic of each to get the idea. 2005 with a regular dinette 2013 with the pit dinette
We have 3 of us and I still watch what we keep in the RV's storage cabinets. Last March when we cleaned out the old 2005 (24') trailer I looked over everything we had packed in it to transfer to the new 2013 (25') trailer and said did I use this item in the 7 seasons ( 380 nights camped )we owned the old trailer to keep it in the new one....Nope out that item went....I have one cabinet (yes, the DW gave me one to myself) I keep my Vacuum (Shark) small box of flashlights, a box full of fix-it items (tape, assorted screws, bolts & nuts, lightbulbs, wax rags, bike inner tubes and a few bike parts) Trust me when you have kids and bikes, things will break. So far I have been able to fix every biking mishap. We have 3 outside storage bins where one of them I keep a complete basic tool kit and a small tool box.