Never assume a new boat trailer is roadworthy in regard to the wheel bearings/hubs. If you do you might find yourself stranded on side of the road in 107F air temperature. I'm just sayin...
Especially if it's from Bass Pro. My brother bought a BRAND NEW boat and trailer from them last December. One of the tires blew within weeks and then the other shortly after the first. When he got the titles in the mail he was shocked to find that his 2011 boat was sitting on a 2007 trailer. The tires had rotted while sitting for 4 years.