What I did with mine was to cut away the receiver mounting platform so that it was flush with the belt tunnel and then I made up a cross brace strap from thick lexan (some old Parma stuff I had kicking about) to go across the whole width of the chassis and drilled it so that it fitted over the rear body mounts.
The body keeps the cells from moving around too much anyway but the extra bracing just prevents the inside edges from lifting upwards.
Instead of lexan, you could use thin GRP or even carbon.
Works fine for me.
HTH
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