a 40' fifth wheel is certainly overweight for a 3500 1 ton.
but ignoring that for the moment.
5th wheels turn WAY better than TT's, it's effective length is really quite a bit shorter (between the overhang, etc) and you can truly jack knife it (on purpose)
You have to watch your tail swing. You can clear your obstacle and then whack the other (blind) side with the tail swinging around.
5th wheels are TALL (also gives you lots of head room)
I'm in Longmont (just north) and I've got a 45' motorhome and there have been only a few RV parks locally we haven't been able to get into. (and they clearly tell you that up front, we don't try). Make sure you tell the park people when making a reservation how big your rig is, they'll put you in the right spot.
It takes a long time to clean a bigger rig. (both inside and out) but we love that king size bed.!!!!!!
