Many of the things I don't think you can get at U-haul. I strongly recommend transmission cooler, Heavy duty alternator and larger radiator. OEM packages usually include heavy duty brakes and HD transmission. In Lieu of these two, make sure you have your brakes checked. I would also suggest using
synthetic oil in the engine and transmission. Not sure what the TV has for gauges, but you might also consider a scan gauge ( link Below), It plugs into the ODBII diagnostic port and will allow you to monitor the TV performance and catch problems early on. Remember to not only do you have to get the rig going, but you have o stop it also.
http://www.scangauge.com/products/