Ford V10 2-valve engine oil pan gasket is not reusable - must replace. Unlike 4R100 trans pan rubber gasket which can be reused. Use Fel-Pro or Motorcraft replacement with RTV only at corners.
For the Jamboree fridge, check LP gas flow, burner for debris, and 12V power. Ford 460 EFI conversion costs more than the RV is worth - maintain the carburetor instead.
4x4 RV transmission filter service same as 2WD. Also service transfer case and front differential with correct fluids per manufacturer spec.
Codes for entire bank coil malfunction indicate PCM failure not ignition problems. Shipping to PCM repair company for rebuild and reflash is good approach. Discoloration on board confirms internal failure. Common issue on late 90s Ford chassis.
4R100 has no factory gauge sender. Add sender in pan or cooler line for aftermarket gauge. ScanGauge reads PCM temp without hardware.
Spin-on trans filter kits allow easier changes. Mount in cooler line. Use as supplemental to internal filter. Multiple kit options available.
Transmission issues - check fluid level and condition first. Regular fluid changes prevent most problems. Scan for codes to help diagnose.
For your 2000 E450 V10's uphill struggles in the Rockies while towing, rear end gear change will provide the most significant improvement. An SCT programmer offers moderate gains, while K&N filters and cat removal provide minimal power increases.
Ford motorhomes typically use the 4R70W, E4OD, or 4R100 4-speed automatic transmissions depending on year and engine. The 4R70W is most reliable for lighter duty, while the E4OD/4R100 handles heavier loads better.