Over the tanks is the way to go. Bikes are always in view . No bouncing easy to load and unload.
I had an Arvika rack on my TT for 4 years. Same rack is now adapted to mount on my 5'er
Arvika bike rack,
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19'Duramax w/hips, 2022 Alliance Paradigm 390MP >BD3,r,22" Blackstone
r,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,Prog.50A surge ,Hughes autoformer
Porta Bote 8.0 Nissan, Sailun S637