total weight and pin weight for a confortable tow

It also depends on the type of 5er you tow, toy haulers are extremely pin heavy unloaded, they are designed to have the garage weighted down to make the pin more reasonable. I tow an empty TH, the garage is a bedroom by night and a playroom by day (the 5&7 yr olds are back there). Mine came with a generator in the front, which doesn't help, and is maxing out the rear axle of my dually. An empty 30' TH would likely overload your rear axle.