TL;DR: The Peak Design is a mistake for cliffside winds; it lacks the necessary rigidity for an S5II setup. Look at the Leofoto LS-324C Ranger Series Carbon Fiber Tripod for a better stability-to-weight ratio. Building on the earlier suggestion, I've unfortunately had issues with the Peak Design Travel Tripod Carbon Fiber during high-wind shoots. While the portability is nice, the thin leg diameter and articulated center column create a resonance frequency that makes video footage unusable with a heavy lens like the 24-70mm. It is just not as good as expected for full-frame glass in real-world environments. The flex in the legs is quite disappointing when youre trying to lock down a shot. The Manfrotto MT055CXPRO3 Carbon Fiber 3-Section Tripod is a tank, but the weight is a massive downside for a wedding. For your $550 budget, the Leofoto LS-324C Ranger Series Carbon Fiber Tripod with the Leofoto LH-40 Low Profile Ball Head is a much better middle ground. It omits the center column entirely, which is the biggest source of instability. Technically speaking, you get better vibration damping and a 33 lb load capacity which handles that Lumix brick easily. Another solid choice is the Benro Mach3 9X Carbon Fiber Series 2 Tripod. It has better weather sealing than the Manfrotto flip locks, which is crucial for cliffside salt spray. Basically, dont risk the PD for this specific gig or youll be fixing micro-jitters in post all week... it is just not worth the stress.

I think the lighter legs might be risky for a heavy lens. Not sure but I would suggest being careful and choosing something heavier so it dont blow over in the wind.