However, I'm alarmed at the rate people are losing them. Arbitrarily increasing their ground defense is the easiest a solution, but also the least historical and the mostly like to ruffle feathers.
Adding a new hidden 'ability' that helps recon cars survive is the best solution, but the last thing Panzer Corps needs is more undocumented features (plenty of QQ over this already).
Some examples of new abilities:
Can only be spotted when adjacent (submarine)
Has a chance to evade attacks (submarine)
Attacks that kill recon units instead reduce them to 1 strength and force them to retreat (even if they have entrenchment!). Any attack on a 1 strength recon car will kill the unit.
And so on.
So... Options people? Or are we happy to see recon cars get good use, even if they end up as sacrificial fodder time and time again. (at least they're cheap!)

