The OEM bars are strong, but have a decent amount of flex. I'd be prepared to expect a bit of wobble "feel" (but still secure) when moving around. This is on top of the small vehicle suspension sway that already exists when an adult moves around in a RTT at night. Falcon (very nice) is 2per so I think you'll be just fine.
FWIW, I chose the Front Runner slimline II to mate with iKamper 2.0 for complete roof rigidity (2 adults + 2 kids starts to add), flush fit, and ability to still mount 270 deg self-supported (no poles) batwing awning. Other racks like Prinsu (one of my fav's) vertical side rails didn't appear rigid enough for RTT+batwing. So if you ever think you'll go that route, keep that in mind. The iKamper's two track rails fit inside the Slimline tray (rack crossmembers sit 1/2" below the top of slimline perimeter tray). This way there is virtually no gap between outside of RTT body and top of rack. It looks like unison piece, not disconnected. This may be an aesthetic tertiary issue, but when one starts putting larger RTTs on stock racks a good way above the roofline of vehicle, there is a bit "that doesn't look right" going on. Best pic I could find from yr or 2 ago to show what I mean by unison.
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In case you haven't seen... Roofnest Falcon+ Slimline II on 100-series. Nice fit.