1. The first thing to identify is the load capacity of the vehicles roof? The roof load capacity of the vehicle should be inside the vehicles manual or available by phoning the manufacturer or dealer. Having this knowledge will allow you to determine whether or not you can go any further towards getting a Roof Top Tent. 

2. If the roof capacity is capable to hold enough weight to support the total requirements, the next step is selecting the roof rack kit. you need to ensure that the bars you select will carry this weight whilst the vehicle is moving.roof rack bars are rated on moving capacity as the vehicle is in motion, objects on the roof are subject to drag forces and other pressure.