I've gone LB/SC, SB/CC and now LB/CC all SRW and have to say that so far the current version has been the best for our use.
Yes, even that can be a handful in a tight parking lot with the overall 23 foot length. Those parking spots just aren't wide enough to make a turn from a lot aisle. A dually is even worse. Now, is a dual wheel pick up a better prime mover for a 14,000 RV? It may be but then it may be more then you really need particularly if you plan on using that truck as a 95% daily driver and a 5% tow vehicle or even used as a tour vehicle after you get somewhere. It also cost more to buy, drive and maintain. A nice point with our SRW - it fits in our 24x24 foot two car garage while dually can never go there. Do your homework with the spec sheets for whatever brand you choose and you may be surprised as to what each product line has to offer. Here on iRV2 - it's only opinions and bigger seems to always be better - whether it really is or not
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')