I also said it didn't have a real frame. If you tried to pull 5000lbs with a Ridgeline, you'd probably end up leaving the trailer and part of the rear end behind, that is if the thing even has enough torque to start moving.
Torque is one concept that everyone learns in school, yet few people understand.
The ability to perform work is dictated by power, not torque.
The way you get useful torque is by running your power through a transmission. If I want my Corolla's tiny engine to pull a trailer full of cattle (assuming nothing would break), it
can be done by using a transmission that strongly favors torque over speed. That's the kind of transmission an 18 wheeler has; those things are in third gear by the time they get through an intersection. If you're trying to pull 5000 pounds using what's basically a Honda Accord engine, all it takes is a good transmission.
For the record, my parents motorhome from the 70s has less than 300 HP but the vehicle weighs over 10,000 lbs. It accelerates slow, but it works fine. A Honda truck pulling 5000 lbs would be less than 10,000 lbs total and is powered by 250 HP. The only reason you would want a bigger engine is if you want to accelerate faster or if you want to go up steep hills without losing speed. A small engine will still pull a large load up a hill, but to get the proper amount of torque may require the vehicle to be in a low gear, and this might cause a slowdown . Instead of being in top gear at 1500 rpm, you'll be in third gear pushing 4000 rpm to maintain speed. If third gear isn't enough, it might even need to be in second gear, so you'll be going up the hill maybe 40mph instead of 60mph. If you're hauling a huge boat around on a trip you make once a year, speed is probably not a concern.
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