First off, nice job on the video. You really showed what you're dealing with.
Several things.....first, you might want to invest in a radiator pressure test tool. Harbor Freight has one for under a $100.00 (you can never have enough tools). With the pressure tester, you can pressurize the system and better check for a leak. Pressurize it and then put your phone camera up in the corner and snap some photos. Even if you know it's the radiator, the pressure checker is good for double checking the work at the end.
I've never pulled an F53 radiator, but it looks like there could be two ways....
One, pull everything off the front of the radiator, which would include the A/C condenser, the part with all the bolts you were pointing to. On that, try to unbolt it and move it out of the way, WITHOUT disconnecting and breaking the seal on the A/C freon. I'm doubting though it will come out the front.
The second way, run the coach up on blocks and drop the radiator straight down. Disconnect and remove the upper and lower hose, disconnect the two trans cooler lines and move them to the side. I would then try and remove the fan blade from underneath and drop the shroud and fan at the same time. If all that works, remove the four bolts for the radiator and drop it out the bottom.
Obviously, once everything is out, I would replace the water pump, thermostat, belts and hoses, including heater core hoses and heater control valve. Those will all be hard to do later. Once done, your cooling system will be like new.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor