Heaviness: Depends on the size and MFR. The
Overland Accessories tents come in two sizes, the big one is REALLY big and quite heavy. Takes two guys and a few groans and grunts. The smaller one is MUCH lighter and still takes two people because of it's dimensions, but it's much lighter. I can hold it up off the rack with one hand while repositioning the anchors for it with my other hand. I think the smaller ARB tents are very similar. The Maggaloina (sp?) tents are pretty light too, but the big expedition style canvas tents are pretty heavy.
I don't own one, as I have 4 people in my family, and two of us are very tall, so we just wouldn't all fit. However, I've had the Overland Accessories tents mounted on my truck (both sizes) and it does just fine up there. I prefer the smaller one though.
There is some wind noise, but it's not too bad. Very similar to driving with the sunroof cracked up in the angled "vent' configuration. After a few miles, you don't notice it at all.
Here is the smaller Overland Accessories tent mounted on my Hannibal rack, on OffRoving's LR3 ;-)