Only problem with blocks under front landing gear legs on a 5rv......the more the legs are extended the more unstable the front of 5vr becomes.
Just a little bit of fore/aft movement and landing gear can slide off blocks or topple blocks. One side coming off and possible twisted frame.
I have used a 6X6X12 block a few times when CG site sloped in front. I used between the tire chocks and ground chocks in front of all tires.
Didn't care for it at all.
Just how much of a slope are you talking about?
A slight incline.....OK
A steep incline where blocks are needed to get front high enough....personally I wouldn't.
But I have seen some leveling techniques that just make me quiver.
Here is a little story......
LINK
