On some of our resin bodies with the wheel wells hogged out, there is not a lot of material there for strength. In combat, they might break or over time they might even sag a little.
As a preventive and/or repair I like using very small brass rod.
I use the 1/32 K&S #8160 rod. It is easy to press into place and secure with super glue.
You might not think so, but this goes a country mile in adding strength and helping prevent breaking.
It also works well with repairs. Once the body is glued back from the break, try adding this.
Just a tip for anyone needing repair or preventive maintenance.