Fairford roof tent

Wow!!

Seen many thing on here but just googled this!!

For a heavy object such as that and a lot heavier when occupied it's need some thought as to how to install it.

How would you be able to have solar panels AND that, doubt you could?

Have you considered a drive away, preferably pneumatic awning instead? Assuming you need it to house more than 2 people, does the van have rear seats and seat belts?

Also eliminates virtually any wild camping? Height for ferries??

Or an awning room which zips onto the existing wind out awning?

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So the first picture the what is fitted to look good but has holes drilled to fit so more problems with leaks not needid you can’t see the n/s as the blind is next to it . Solar panels can only be fitted inside it this is just some reasons there are more problems then good points
If fitting anything to take load on the roof needs to be done with correct items to only put the load on the roof as it is made to do or you will do damage to the roof 
My second picture is a correct rack and my solar panels all mount to it no shade at low sun light from the roof vents no hole’s drilled in roof
Do a job but do it right from the start
Next you need to be able to get up there safely as well