Maximum tow speed for 6500 lbs Toy Hauler with two axles

I’m in Canada. Most highways are 100km/h to 110 km/h which is about 62 to 70 mp/h roughly. I rarely exceed that unless I’m passing in a hurry, which isn’t often but you know, idiots. Anything faster just eats fuel and there’s less reaction time and more stopping distance required when **** happens, plus I have my family with me so it’s just not worth it to go any faster.