Short reply: I wouldn't use an exterior inline filter.
First question should be what you want to accomplish and remove or reduce. Sediment? Bacteria/micro-organisms? Chlorine? Or ...? Some don't care a whole lot about the water they use and some are the opposite. There can be a lot of technology to filtration depending on what you want to do.
Using a filter with carbon in it for exterior use is not recommended. Removing chlorine will leave the system inside your TT vulnerable to bacterial growth. If you want to remove the taste/odor from chlorinated water, use a point-of-use carbon filter on or under the kitchen sink and a sediment filter ahead of that. Filters with KDF do NOT prevent bacteria from passing through the filter. KDF makes a filter "bacteriostatic" meaning it reduces bacterial growth on and within the filter. Note that giardia and cryptosporidium parasites are chlorine resistant.
The above noted Camco filter is rated 100 microns which is rather coarse and will still let finer sediment and other particles through. I think all available exterior RV inline filters have carbon in them so you should decide if increasing the risk of bacterial and microorganism growth is acceptable to you.
When looking for a filter, look at the specs. Some have few specs or even none. Look for a filter that is NSF certified otherwise they can make exaggerated performance claims. "RV approved" means nothing. Some have a low flow rate (0.5 gpm like the Camco for ex.) and that's before it's plugged up with sediment. Look at the capacity rating (life in total gallons). The inline filters have a low capacity rating compared to larger cartridges.
If you can't or don't want to install filtration inside, I would suggest a 10" whole house filter housing on a stand like in the pic. That opens you up to a whole new range of filter specs and characteristics. I would suggest just using a sediment filter outside and then a POU filter at the kitchen faucet. I would use a 5 micron string-wound sediment cartridge as they are cheap and will not grow bacteria on them. Use a clear housing so you can see the cartridge. This filter will allow chlorinated water everywhere inside except where you use another filter. You could even use a 2nd whole house filter on a stand along with say a 1 micron ceramic cartridge (Doulton, ex.), which can remove some but not all pathogens.
In our TT, we use 3-stage filtration using 10" whole house filters, ending with a 0.2 micron UF cartridge.
http://ecx.images-amazon.com/images/I/71reLsPgfbL._SY355_.jpg height=200 width=200
FYI. The blue Camco DOES have KDF.