Water pump timing cover surface irregularities on Ford E450 Godzilla engines can cause overheating if the mating surface is damaged beyond acceptable tolerances. While some surface marks are normal, deep grooves or pitting requires professional machining or replacement.
Your 2023 Holiday Rambler Nautica's persistent problems with the Aqua Hot system, leveling jacks, and multiple warranty issues indicate serious manufacturing defects. You need to escalate beyond your local dealer to Holiday Rambler corporate and consider lemon law protection.
Jayco Precept wipers use Ford chassis system. Check fuse, switch, and motor. Common issues are motor failure and linkage binding.
The Cummins 6.7 fan hub bolt shearing is a known issue on Freightliner chassis motorhomes. Prevent it with regular bolt inspection, red Loctite, proper torque, and upgraded Grade 12.9 hardware.