Yellowstone/Teton National Parks

I'd really like to know what you mean by a 'few days' to see both parks.

If, for instance, you mean 4 days total then just split it up. If you have 7 days then 4 for Yellowstone and 3 for the Tetons would be good.

You would waste more time driving if you plan to only stay in one place for both parks. Also, staying outside the parks is a waste of time - in our opinion.

As stated, both parks are huge - Yellowstone even more so. Both parks have many very nice campgrounds or even RV parks. I'd really suggest moving from one park to another and perhaps do a little siteseeing as you travel between the two.

If you want hookups your two good choices would be Fishing Bridge in Yellowstone and Colter Bay RV in the Tetons. For both you need to make reservations months early.

For non-hookups, Madison in Yellowstone (reservations needed). For the Tetons either Colter Bay campground (next door to the above Colter Bay RV) or closer to Jackson is Gros Ventre campground (our favorite). Both of these have 300 non-reservable sites and a handful of electric sites if you're lucky to get one. These two campgrounds rarely fill.

There is absolutely no issue with you driving your RV in these parks. You certainly won't be alone. Parking and siteseeing may be problematic at some of the more popular stops.

Be sure to check out each park's website for lots of good information on camping, roads and things to do.

You should give 4-5 days at Teton and stay down near Jackson at Gros Ventre campground. You won't need reservations there but DO make reservations in Yellowstone NOW. Give Y about 5 days too... A couple more if you have the time. I recommend Bridge Bay because it is located well. Plan on two full days on each loop(two) and another day or 3 to do stuff you missed or want to see again.
We like eating at lake lodge cafeteria. Reasonable and filling and Great Lake views.

You can't even stop at the geothermal spots and see it in a day.

We had to do a four day trip due to our schedule (would have been five except for a blowout in route.) We stayed at Bridge Bay and it was decently central for both parks. We did three days in Yellowstone and one if Grand Teton. Wish we'd have more time at Jenny Lake in Grand Teton.

Now, we are up at the early light and beat traffic to the first couple stops. That helps a lot. And you really need to plan your routes. Google is your friend for the next year and lots of good threads on here. I've argued that the major national parks need stickies.

All very good advice so far. What is your definition of "a few" days? If you're planning on spending 3 full days/4 nights (or, heaven forbid, less than that), then you probably would be best off staying in one base camp and doing both parks, as best you can, from there. If more than that, then 2 base camps - one for the Tetons and one for Yellowstone - would be a good idea.

Our personal preference in campgrounds leads me to suggest Colter Bay RV Park (for hookups) or Colter Bay or Gros Ventre Campgrounds (no hookups, or limited ones) for the Tetons, and Grizzly RV Park in West Yellowstone or Madison CG (inside the park) for YNP. Grizzly is a very nice park with full hookups, nice showers, laundry facilities, etc. and is only a few blocks from the park's west entrance. You'll do a lot of driving anyway, so it doesn't add tremendously to the load, IMO. Madison CG is 16 miles east of West Yellowstone, no hookups but definitely the in-the-park atmosphere. Very popular; make reservations for Madison ASAP.

If you want to spend most of your time in one park vs the other, you can use one base camp and visit the other park from it, but it's a LONG day from Grizzly to Jackson and back, or from the Tetons to the north end of Yellowstone & back.

We have been to Yellowstone/Tetons twice now. The first time we stayed in Tetons Colter Bay, if you stay here, make sure to make reservations. It's full hookups if I remember right.

Then we went up to Yellowstone. First trip we did everything from the Fishing Bridge Campground. I do not recommend trying to do Yellowstone using one central location. It's just two big, and we had to do alot of driving.

So on our 2nd trip, We spent only 2 nights at Fishing Bridge(saw that part of the park), then we camped for 2 nights At Madison Campground(its west Yellowstone), then we went to Mammoth camp ground, it's north Yellowstone.

The 2nd trip was alot more enjoyable, and we got to do and see alot more. You could spend weeks at these parks and still not see everything. But they are two of my favorite.

A lot also depends on your definition of "see the park". If all you are doing is parking at thermal features and view-points for 10 min, a day is about right.
If you are getting out and walking (or hiking, or...) a week might not be enough time.

The drive into or around the park isn't "challenging", just a Lot of it, Yellowstone alone is huge, and then there are the traffic jams, caused by folks viewing the wildlife, including the "buffalo Jams", remember, they have the right of way, no matter how long it takes for them to move.
As far as Jackson to do both Parks, Jackson to Old Faithful is roughly 95 miles.
A "Few" days is not enough to do either park by it's self, much less both.
You may want to pick one, and spend all your time there, then save the other for another time, when you have more time.
We spent 9 days in Yellowstone & 4 days in the Tetons, next time we'll spend more.
If you try to do both in just a few days, it'll be just one long Drive-by, you really wont see much.

My apologies, planning on going next June

We go there about every three summers without reservations. There are several no reservation USFS CG that we like outside of the parks. Just N of West Yellowstone is Baker Hole and if you get there early enough you can usually get an electric site... same as Gros Ventre N of Jackson. East of Moran Junction is Hacket USFS CG a couple miles past Grand Teton RV park that's $60+ for not much. All three of these USFS CG have water if you have a long enough hose and only Gross Ventre has a dump and it has 300 sites with 36 electric.
At 27' you can probably get a walk up site at Madison which is on the west side of Ystone. We stayed at Baker and Gros last month.

When are you planning on going?