Hi John i have a 200l tank under the bed , and a filler on each side both are towards the back as if you want fast fill hoses you can only go 6-7 ft from the tank as joining the hoses is frowned upon, but its just a matter of blocking some pumps when filling

or in the large filling stations i back in to the pump ,, or you could have a slow fill with the copper pipe and get it fitted where you want
FORDY