Yes, high-output alternators can be installed on your F53/Triton V10, but you'll need to upgrade wiring and possibly the serpentine belt system. The Tucson unit you found is a solid choice for your large inverter battery bank needs.
Underhood generators and idling work but check local idle regulations. Extended idling wastes fuel and causes engine wear. Solar, generators, or DC-DC chargers are better long-term solutions.
Saginaw pump popular upgrade for older Ford chassis. Kit needed for proper installation includes bracket, pulley, and hose adapters.
The 1989 Georgie Boy Encounter with Ford 460 typically uses 2-3 belts: one serpentine belt for main accessories and possibly separate belts for alternator/AC. Check your specific pulley configuration and measure existing belts or pulleys to determine correct routing and sizes.
For 1996 Ford 460 FI engines in RVs, the correct serpentine belt is typically Gates K060885 or Dayco 5060885. Always verify by measuring your current belt or checking with Ford parts using your VIN for exact specifications.