The M1070 HET has the same 53" tall 16.00R20 tires as the MTVR, but the M1070's GVWR is only 86,000 pounds, not 175,000 pounds.
And the M1070 has a top speed of only 45 mph as compared to the MTVR's 65 mph top speed, making the M1070 useless to us as an RV...which is why we don't own one...