Trailer Length (generally speaking)

Sadly. YES there will be sites, and CGs you will not be able to get into. And at the CGs that have long enough sites, you will be limited in your choice of good sites.
For example. At the National park we like to visit. There is only 3 sites that out 31" TT will fit into.

Another example. When you call a CG and they ask how long. You are often placed out in an open field. Fact is. The longer the TT. The less site choices you will have. It is a trade off.

No issues with finding a site to fit in with our 32' TT being hauled around by our crewcab Chevy HD gasser. Private parks are never an issue as they have sites to fit any size rig, and state/federal parks usually have a few sites for the big rigs. You can always reserve ahead of time to eliminate any surprises upon arrival.

"In most instances, larger trailers are easier to back up than smaller trailers. It is a wheel base thing that keeps the trailer from jackknifing so quickly that you can hardly react to it. I am sure somewhere on this wonderful web there is an explanation of how that works. "

Once you get to having two axels, regardless of the length, backing the trailer is much easier. Single axels are a PITA because as you noted the single axel is far more sensitive to steering input. I think they can jack knife when you are just looking at them. :B

At nearly 30' the OP will have fewer choices of sites in most CG's but not prohibitively so. It is usually the tight access roads (that can seriously inhibit your ability to get lined up for backing), that pose the biggest challenge vs the actual site size.

:C

My TT is 36 ft, 37'4" to the back of the bicycles on the bumper mounted rack. My pickup is 22' long. I consider my entire rig 58' long.

Trouble finding camping spots. Never in commercial parks. There are a few state, county, city or federal parks where I can't take my rig. But there are tons more parks where I can go. I've never felt length prevented me for going where I wanted to go.

However, some of the very best dry camping spots in mountain area National Parks and National Forests cannot take my rig.

Many have a 18 ft or 24 ft limit.

The only one which bothers me about not fitting is Mount Rainier NP - with a hard 27 ft limit on trailers. Been one person on this forum who was asked to leave after parking his rig correctly because the rangers measured it at almost 30 ft.

We camp hosted at Chisos Basin CG in Big Bend NP. It has a 24' limit. Frankly only about 1/3 of the spots would hold a 24' trailer. And we had a 32' class C in the campground once. We didn't walk around with a tape measure, but I did have to ask some people to reposition their trailers/ class C. As long as the road was clear - that was fine.

A bigger problem occasionally is finding a place to park the TV. I've had to put my TV in overflow parking at one TX state park because the parking spot was 39 ft long, and there was no place to put the truck.

We have 31' TT (pic in profile) and have been all over the country. I can only remember one site at a SP that gave us an issue and we were just doing an over night stay.

We tow a 36ft TT with an F-250 short box and have never had a problem finding or getting into a site. Total length for us is 56 ft.

We are at 28' which is just a bit shorter than what you are considering. As other replies to your post have said, commercial CGs will ask the length of your rig and put you in something suitable (in MOST cases!!). In over 20 years of towing, we have yet to encounter a CG that didn't have a site large enough for our TT and I suspect you will have no issues, either.

Quite frankly, at 28'-30' you will have a much larger selection of sites from which to choose than the folks that went out and bought the biggest RV they could find. I have zero sympathy for those who do so and then whine incessantly about their sites being too small. JMHO

Your question is very subjective and to be answered correctly you need to look at where you want to go with it, how much experience you have driving a long rig and what your patience is. I have a TT nearly 34' long but I have a lot of experience driving and camping. We also spent the last 20 years exploring the country every chance we got. I think the 28-30 ' length is still very doable most everywhere. I also think that in that length you need to do a little planning as there may be sites and certain camps that are too tight. I am on that new adventure as to where we will go to areas and set up camp for a week or more and then use the TV to go exploring. So sit down with the family and decide what type of camping you want to do and then decide if the TT fits the need. As far as backing etc.. that becomes easier not more difficult as long as you have the clearance. I used to take my 10' motorcycle trailer and back it most anywhere with my 35' DP that is much more difficult than backing my 34' TT with my Pickup.

The majority of campgrounds ask the legnth of your trailer when booking a site. They are aware of what fits where within there campground, and try to put larger trailers on larger pads, smaller on smaller.

This does not mean they will not push that envelope if it means an empty site (no money) or squeazing you in there (making money). Often it will come down to your ability to back the unit into that smaller site.

The big thing is to be comfortable backing the unit into those---barely fit---sites. Everyone on here can probably tell the story were once the trailer was unhooked, they had to find a place to park the TV cause it was blocking the street.

In most instances, larger trailers are easier to back up than smaller trailers. It is a wheel base thing that keeps the trailer from jackknifing so quickly that you can hardly react to it. I am sure somewhere on this wonderful web there is an explanation of how that works.

We bought our 26.5 ft 5er with a very livable floor plan and will fit in a 20 ft site if clearance in the rear....also have cc long bed truck for longest wheel base for towing....total length of rig is under 45 ft....a ball hitch off the bumper trailer same size would be over 53 ft...drawback is 5 er height....but is not issue for us so far