??? i never had any problem with the wabash, my temp is under 90°C with the 16/66 ratio... and runtime is about 15 min. This is a legend... that's not because the manuf. doesn't advise the use on e-maxx, that you can't use them...
Why should it be a problem? you seem to be horrified... personnaly i like this drive style... i also run mashers and mulshers on 40 serie beadlock wheels...

i don't understand you about the gearing, it's just a question of rims wideness, not diameter???