If at a semi-permanent or permanent site, I'd get the well water tested to see exactly what needs to be, or can be filtered. No point in using filters that won't help anything. Is the water treated? If a private well with few users, likely not. Carbon filters are used to improve taste and odor when chlorine is put in the water and won't help much otherwise. Well water can be great or really bad and I'd rather know what's in it.
Whole house filters may not be needed in terms of flow rate, but will def. make them last longer between replacing them.
Two 10" whole house filters is a good setup. Use a 5 micron sediment cartridge first followed by one with a rating of 1 micron or less. Don't use a paper type cartridge because bacteria like to grow in them. Use a "string wound" one. Doulton makes some excellent ceramic cartridges and have ones to remove various different things. Get ones that are NSF certified otherwise the manufacturers can make exaggerated or false claims. For the final 1 micron filter, get one with an "absolute" rating not "nominal". The Doulton cartridges are nice because when they get plugged up, you just take a Scrotchbrite pad and clean the outside off. Doulton has a lot of excellent info. and is worth some googling. Use a regulator. Water quality, filtration and cartridge types can be quite complex if you get into it. Don't grab whatever just happens to be on the shelf at an RV dealer or big box store.
I installed a 63 micron sediment "prefilter" followed 3 10" whole house filters under the sink. One is a 5 micron sediment, next is a 1 micron Doulton ceramic and the last is a 0.2 micron "ultrafiltration" used for drinking water only via an RO type faucet at the kitchen sink. It all easily fits under the sink at the back of the cabinet and doesn't interfere with anything.
