Thank you Wanderer.
Speaking of beautiful country, my wife and spent all of July exploring British Columbia including Vancouver Island. Yes, we went to Butchart Gardens (did I spell that right?). Gorgeous!
Here's what I thought might be the case: if a hitch is rated at 500 pounds, they must account for the trailer experiencing bumps on the road. As the trailer hits the bumps, its tongue must bounce up and down on the hitch. So even if you load a hitch at 500 pounds, bouncing down the road can put maybe twice that load on the hitch. Therefore, considering safety margins, the hitch might be designed to fail at, say, 2000 pounds. If that is the case, then maybe a load of 630 pounds on a 500 pound hitch isn't so bad. I'd just need to take it easy on the bumps.
However, having said that, thank you for the warning about BC checkups. When we went through BC in July we had a slide-in pickup camper. Now we have our Coachmen TT.
Best regards,
Vern.