The Starcraft folks will be here soon . . .
A Rule of Thumb is 300# closed, 150# popped up, minus the weight of the AC, although your limits may vary.
Putting the beach cruiser, kids bike, mtn bike and road bike should not stress the limit of the roof, just your back getting everything lifted and mounted
. I'd be more concerned about the rear wheels just bungeed on to the rail myself. And with the Blockheads your road and mtn bikes are probably OK (quick release frt whls) but the cruiser and kids bike? More prep time before and after pulling on and off the wheels. Get a nice set of bike racks (Swagman makes a decent inexpensive rack) or Yakima, Thule, ProRac or search the various homemade racks on the forum. Then you can just load the bikes with the wheels on and away you go.
Enjoy the ride!
PS consider a way to cover the seat/handlebars/fork/computer on the road bike. Do you know how hard it is to get bug guts out of the carbon forks and computer
We won't even mention a wet leather saddle (yes I'm old school that way) with bug guts . . .