there is also the max axel weight if it matters, some don't care, but I have been mindful of where the weight ends up and sill tanks help put it onto unused front axel weight.
Suspension also comes into the load ride if it's all on the rear. Set it up nice for expedition and it can be tough around town empty. Airbags solve this but it's usually more expanse that can be avoided if you like coils.
Rear quater tanks also foul with 33" (255/85/16) tyres which many of us progress to.
The sill tanks look like they can collect all sorts of things, but in reality with the bevel type they only fill the void that exists there anyway. Yes you can dint them but you have to be doing some pretty serious angles over rocks. If its a dirt bank they just slide along with the car and that's about it. These times are minimal for most of us.
There is nothing wrong with a replacement a tank and rear quarter tanks, just a different way of doing it. Standard suspension is very good, but it's not the be all either. And many are happy with standard 32" tyres.
Do the sums, everyone has a budget, but don't be in too much of a rush to build the new car. Do it once and right.
