Welcome! I too tow a 17B with a 2006 Toyota Sienna with towing capacity of 3500lbs without issue. Sure, we take it easy on mountain passes and usually try to just ride the tail of a decently fast semi, but we haven't had any trouble with power, we're trying to baby the van because we want to keep it going strong for years! On flat, decently paved highway, we hardly know it's there.
Hillary & Jeff
Camping with the sighthound variety pack