5er brands/models

The Montana 3730FL / 3731FL seems to have what you want. And just under 40'. It has two sofas that make into two beds. That would certainly be better than 3 kids that big in one bed. But I don't think you will find it for under $65k. Most new Montanas go for $65k and up. Googling than model number will show you dealer's web prices nation wide. That price will vary significantly dealer to dealer. But you can use the lowest you find as a bargaining tool at a nearby dealer.

And the Montana Owner's Club Forum is a great forum for Montana owners. Great people willing to answer all questions and help solve any problems.