2006 Lance 881 vs New 855s

I test drove a long bed truck and that just wasn't happening as a daily driver in town. The Toyo 295/65r20 at tires planned for the stock wheels are rated at 4080 each for an axle total of 8160 for the axle. The stock 285/60r20s are rated at about 3750 each. 19.5s are not an option I'm willing to explore due to terrible empty ride and not being able to air them down if necessary. It looks like I'll just need to wait until I get the truck in to see what the door sticker actually says. If it really is ~3800 as Mello Mike's is, the 881 is just more camper than I'm comfortable with.

And all I need is room for my wife and I and two small kids, one of which is a baby on the way. The slide is almost a necessity if you get caught on a rainy day in the camper.