Nobody has mentioned trailer lights. You are not going to be able to plug into the 24 volt trailer lights so a cheapo set of magnetic lights from Harbor Freight will get the job done. I would jack up each side and spin the tire and listen for any bad noises. If smooth and quiet I would probably just go for it with the heat checks mentioned above. But if any roughness or loose wheel then the bearing needs to be checked. Pull the nut and outer bearing and if that bearing is dry then the inner one will be also, if it is well greased and the wheel was just loose then I would not knock out the bearing before pulling the hub off and pushing in on, and turning the bearing by hand. This will tell you if it is rough or dry. I am guessing you are going about 150 moles and that is not all that much as long as they are greased, even if they are rough. They are fairly big bearings. But take jacks, jackstands, tools, grease and grease guns, lot of rags and roll towels and hand cleaner. Be prepared for the worst. I always took a trailer to bring my stuff home on, then check it out when I get home. Less worry that way. And in my state the trailer has to be registered and tagged.