I live in the hot dry high desert and have owned a lot of the tin grills including my 73 W200 that my dad bought new. I've only had maybe one tank crack and that was at the filler neck.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/ motormangj@gmail.com