Rod,
It's pretty flat here, no major grades. I would imagine, as long as I'm not in a hurry I would be fine. It also depends on how much you load into the trailer. Empty (with 2 bikes and gear) I have absolutely no problems, loaded down (water, food, etc....) makes a difference.
re: renting: I would highly recommend it. Rent from a dealer, that way, if you decide to buy, they'll likely apply the rental fee towards the purchse price.
Also, when you buy, consider this: When buying an RV you are buying a life style. We've decided that when we are not chasing motorcycle stuff, we'll use it for vacation. That way I don't have to sweat that this trailer will sit in my driveway and doesn't see enough use.