The simple option for would be stacking 3 concrete blocks with a piece of wood on top. If you use wood I would recommend pressure treated lumber. The 6x6 would be a solution if you have a saw that can cut 5.5" thick wood. If you want and approximate 1' by 1' "pedistal" 3' tall you would need to cut 12 sections at 11" each as a 6x6 is only 5.5"x5.5". Place 2 sections on the floor and the next 2 sections on top perpendicular, like cribbing. This would be really solid and you would need 4 12' long 6x6. You could also do this with 2x6 placing them perpendicular to each other as above. You could screw them together and would only need a couple screws in each. This is the method I use for my landing gear on my 5er but they are only 5 boards high, or about 8". I placed a handle on the side for ease in handling.