I would like to know how much weight the rear bumper will hold. I'd like to add a 2 inch receiver so I can add a bike rack that will hold 2 bikes weighing approximately 35 to 40 lbs each. Taking into consideration the spare tire, or if someone can suggest a good bike rack that won't cause stress on the bumper. I had a bike rack on my previous camper and it broke the welds so I'm very worried about putting one on.