Having a fixed water tank and electric pumping system in a vehicle that size , is using too much weight capability , and overcomplicates as your water usage with a shurflo pump will be too big for the capacity . Better from point of view of refilling , security of supply (eg all your eggs not in one basket) , and giving you a reinforcement of how little water you have to play with would be several seperate jerry cans . Before you start building your vehicle start by looking at total weight capacity (payload), and deduct things like weight of fuel, passengers, tools spares , tents , winch etc etc . It will surprise you how limited you will be . I found that a 110/130 size vehicle when used for long distance overland is for 2/3 people at max. JMHO
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