I need a large 5th wheel but am I looking too large?

50' is huge, where do you plan to "camp" with it?
Many parks are limited to campers as small as 30', most get snug by 40'.
Do the boys really need separate rooms, or just sleeping areas?
There are some with a center room, with a separate sleeping loft above such as
Montana 3855
or
Solitude
But they dont have a second bath.
With one already being 16, having an additional room may not be needed long enough to really make it a requirement.
Otherwise the closest I have seen would be a toyhauler such as the
Momentum
And it does have the second bath.
Hope this is helpful.