Is a roof tent safe to use on a normal estate car roof?

My Toyota Corolla Estate has a suggested roof rack weight limit of 75kg. My daughter's Octavia Estate also has a 75kg limit. If a roof-top tent box weighs 67kg - add roof rails and I'm on a limit. If I...

Are there any cars that will fit a mattress in the back but aren't too expensive to insure?

My son, 20, is learning to drive. When he passes, he wants a vehicle to take on climbing, walking and camping trips in the UK. He wants to fit a mattress and climbing gear into the back and sleep overnight....