JMHO: Given that you will probably not be in front of a parts store , when you need the fuel filter and the weight involved , that's one part I would carry on board.
B-in-L had a 2005 Tiffin 35' on the W-22 chassis and struggled to keep the weigh within limits too. Good luck.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.