I don't remember it being terrible, but that looks like it would make it super stable. We've done White Rim and plenty of other mild wheeling with it, getting back to the 24 hours course, Barlett Wash.
Something is gonna move so the easy to fix or replace rack is better than denting your bike frame or rubbing the paint off the bumper. You can see the rub marks from our bikes, there are matching marks on bikes that cost ten times what the rack did...
But OTOH you don't want the thing bouncing around breaking windows or falling off. Those straps are probably right the right balance.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein