Only you can really answer that question as you can look at the RV and see what else might need attention. It is not unusual to spend money repairing an older RV. The items listed are maintenance items. The fuel pump might be the exception there as it is a hit and miss item on the Ford chassis. The 1700 seems a bit high for a pump replacement to me. The fuel pump can go bad for several reasons. One is that it is cooled by fuel and the more often the tank is less than 1/4 tank it can over heat reducing the life of the pump. Two is contamination ie water, rust etc. If the RV sat for a while it is possible that the tank had rust present and that contributed to the pump going bad.
I think the oil analysis is a good suggestion to help determine the condition of major mechanical parts ie engine and transmission. As well as tires and other rubber components ie belts, hoses, etc.
When purchasing used you either pay upfront for a well maintained coach or pay later for the delayed maintenance. When an item has been sitting for a bit the initial uses will reveal issues. After the initial pain usually it will settle down if you keep up with maintenance.
Mike
