We first saw the 347 at an RV show in OKC in 2008. We looked far and wide for a TH that with the "normal" 5th wheel interior and not the NASCAR look but could haul our Harley Ultra Classic. After we decided on the 347, we got a quote after sending an email from their website from Bob at Lakeshore in Michigan. We then used that cost to deal with our local dealer in OKC on just what we wanted. We got a 2011 with the 5.5KW Onan generator, slide awnings, 2nd AC, and a few other things. It took about 8 weeks after making the deal or 3 weeks longer than the dealer told us to expect. Without any extras we were setting at about $39K from Lakeshore but with everything we paid about $43K delivered from our local dealer LeisureTime RV. They were fine to deal with by the way.
We don't full time in ours yet but have traveled several thousand miles & camping several weeks in it since June this year. It tows great for a big rig. Setup is way better than the 1994 Jayco we used to use. The airbed we've used many times with our family with us and no problems with that. As a TH it fits our needs well. I added a Condor Clone (Harbour Freight) Motorcycle chock myself. So far the Harley makes every trip with us. I can load and unload my 900 lbs Harley by myself. We average about 10MPG towing with our 2004 F350 Powerstroke. Anything less than a 1 ton (imo) will be pushing it hauling this rig. Let me know if I can answer any questions.
Good luck and search these forums well. The Keystone Mountaineer website has interior videos that may help with the your interior questions.