Hi, can anyone please advise on best place to buy service items. 2002 8.1 Vortec - plugs, oil, air and fuel filters, sump washer. Drive belt as well, and anything else you would recommend. Done 24500 miles, but only 2000 since 2013, so not sure what has been done. Will change all fluids - brakes, gearbox, diff (will maybe just check the ram fluid). Are there any filters on gearbox does anyone know? Also, Onan 5000. Done 273 hours, but stood a while! Plug, oil and air filters, fuel filter. Possibly change front discs and pads as a precautionary. Any tips greatly appreciated and what else any of you would recommend. Have looked on-line and prices vary enormously. Looked at prices in US and way less. Have relatives over there, so may get a bulk buy and get it shipped, not sure.