Boxster on a U-Haul car trailer?

[itsnotanova]

I use to haul 60,000 lbs of flammable, explosive and poisonous gases with a tractor that weighed 12-15,000lbs for a living. The longer the vehicle the more stable it will be at speed. I personally wouldn't drive faster than 70 with what you'll be using because your fuel economy will suck. Does the trailer have brakes? Are they adjustable? If not, then I'd probably keep it down on the speed. Specially when going down hill through the mountains. Most trailer tires are the cheapest tires money can buy. They don't like being over or under inflated. I run mine 5-15 psi lower than the sidewall says. It kind of depends on how high the side wall pressure says to be.