I've been in Vancouver, BC. Sorry for late reply too all.
I have a KAMA 454, (4x4). It should have tubes so corosion will not be an issue. Greg G also noted used Anti Freeze.
I have a FEL, so added weight is not needed on the front.
I will fill the rears to the max so beter side ways stability. Since I don't cut grass, excess weight won't cause me problem.