How Low?

i have a 95 splash and i bought some 18X8" Alessio F1 wheels with 235/40Z Ventus HR II tires. i need to know how low i can bag the rear of my truck without having to cut my bed...other than maybe to allow the pumpkin to stick through a lil bit aired out...i talked to jason at suicide doors and he told me it would be best to go with a cantilever and thats probably the route i will go unless i find a cheaper route that will still allow me to get pretty low... does anyone have any pics of a ranger with a cantilever setup that didnt have to cut their bed floor out?...doesnt have to be on 18s, i jus wanna see how low i can get with the cantilever kit...i dont wanna cut up my bed due to the fact that i use it every now and then to move stuff...i appreciate any help you guys can give me

here are the wheels