5 Row Units 2"x10"seat plank 8"rise / 24"tread depth per row 16"first row seat height Semi-closed planking (4"max. opening) at rows 4 and 5 Single 2"x10"aluminum foot plank at rows 2 and 3. Double foot planks on row 4 & 5. Guardrail system on rear and sides extending to the third row *Additional features may be required to meet local codes. Always check with your local code enforcement office before ordering. *Shipping charges for truck freight shipments are estimates only! Customer will be contacted if actual freight charges exceed estimates.