The bolt itself isn't going to be a problem, but if you can mount the bolts in double shear at both top and bottom, that will settle it.
If in single shear, the bolt needs to be a very snug fit into a suitably long sturdy crush tube, with a big thick retaining washer on the outboard end of the bolt, just in case the rubber bushing splits or ruptures.
If you are still nervous, you can always mount two coil shocks on each side of the car, the same way Jaguar do it.
The off road guys with very heavy vehicles do this all the time, and it makes for some much nicer load paths, as well as halving the loads on each coil/shock.
If in single shear, the bolt needs to be a very snug fit into a suitably long sturdy crush tube, with a big thick retaining washer on the outboard end of the bolt, just in case the rubber bushing splits or ruptures.
If you are still nervous, you can always mount two coil shocks on each side of the car, the same way Jaguar do it.
The off road guys with very heavy vehicles do this all the time, and it makes for some much nicer load paths, as well as halving the loads on each coil/shock.