I am overwhelmed looking at all the different options. Do I need to invest in one of the super expensive ones or is one of the base models okay?
Start by defining what 'surge' you want to protect from. For example, your computer might report 'surge protection' which is power off only because one DC voltage is low. Obviously that type of surge does not exist in campground power.
Most troublesome campground anomalies include open neutral, reverse polarity, missing safety ground, and low voltage (sag or brownout). Nothing, called a surge protector that is for home receptacles, addresses any of these. Do not make a mistake that most here have done. They have assumed a surge protector is a 'magic' device that cures all anomalies. Campground surge protectors do not do what homes need. The word 'surge' has two completely different meanings in those two different venues.
A best and well respected campground protector is from Progressive Industries. And like all effective protectors, it should *never* sacrifice itself. Only profit centers do that.
Two protector types exist. One is installed (hardwired) inside a camper. This can perform essential functions. Second type is portable. Attaches (and best locked) to a power pole. Second type connects so much shorter to a pole's earth ground. Only second type can protect from a completely different anomaly called a surge (ie lightning).
Do not waste money on near zero power strip protectors that only claim to protect from one type of surge. And only if that surge is so tiny to not overwhelm protection already inside all appliances. Those near zero scams are sacrificial. Anyone can see why by reading (and post) specification numbers. Those 'magic' power strips must must 'block' or 'absorb' a surge. How does its 2 cm part 'block' what 3 miles of sky cannot? It doesn't. How does its (near zero) hundreds or a thousand joules 'absorb' a surge that is hundreds of thousands of joules. Obviously it is grossly undersized to fail on a surge already made irrelevant by protection inside every appliance.
Appreciate so many are so easily confused. An anomaly called a 'surge' (typically found in campgrounds) is never what near zero joule plug-in protectors are for. 'Surge' in campgrounds is averted by something that disconnects power when anomalies (ie reverse polarity, overvoltage, etc) occur. This protector takes forever (milliseconds) to provide more than enough protection. This type protector is especially critical for motorized appliances (ie air conditioner).
Another and completely different protector claims to sacrifice itself to protect from an anomaly that is done in microseconds. And that can never be protected from by 'blocking', 'absorbing', or 'sacrificing'. The most ineffective protectors also have a big buck warranty - that has so many exemption as to not be honored.
An industry standard for campground protection is
http://www.progressiveindustries.net/services . Other manufacturers also exist. Do not waste money on something completely different and ineffective from Belkin, Tripplite, APC, Panamax, and Monster. Those near zero joule plug-in protectors do not claim to protect from anomalies typically found in campgrounds.