Yes, we down sized from a C-class motor home to our
Scamp. This is a short history of our RVing:
Our first RV trip, well this would have been in 1971. It was a camper shell on the back of my dad's farm pick-up (1970 Chevy) with a butane tank in back. My wife & I drove from Harlingen, TX to Las Cruces, NM for a job interview. We had two fold up cots (old army style, canvas, take apart to fold), a borrowed Coleman camp stove. The camp stove's leather pump was dry, therefore we had a time getting it to work. Corn oil on the leather to get it going. First time to sleep in it was a KOA in Las Cruces. Got the job, found a small house to rent, spent another night at the KOA. Went to Carlsbad. Can't remember others stops. No real problem. Fell in love with RVing & New Mexico and have been at it for 38 years.
Bought a '71 Chevy Pickup for the camper shell, added build in bunks, storage. It was a neat set up for us. We also bought a new Coleman stove in Las Cruces before we left. Ha!
Traded this set-up on a '85
Scamp II, slept in the back with the tailgate down, or in a tent. Then got an old TC for the old '70 pick up after I got it from my mom. Then bought a TT in '86 (a '83 Komfort Lite) which we took on a trip to Yellowstone, Glacier, Baniff in Canada to Victoria, BC then down the west coast to SoCal & back home towed with the '70 Chevy farm truck. After several new to us tows, we went to a '96 Coachman Catalina C-class MH in '97. We went to Canada again for our first trip with it. This time to LA area then up the west coast to Victoria, BC area to Jasper, to Baniff, Watertown, Glacier, then back home via Idaho Falls area. Then down sized to the 16'
Scamp in 2005.
For a more detailed version see
http://www.fiberglassrv.com/board/in...howtopic=37439 .
Why? you ask. Wanted less to haul around, less to park, less fuel to move it from point A to point B, easier to park, less insurance cost, and did not have to buy a bigger tow vehicle at the time. I also reasoned by being molded
fiberglass it would be less likely to develope
leaks in the roof and would last a long, long time.
What do I miss? The bed, ours is a little cramped in the Scamp.
Some of the non-molded
fiberglass trailers are pretty nice, I must admit. Not sure if I could call the ones built with welded aluminum and a composite siding, often a type of fiberglass a sticky. The ones I had were stickies. You mentioned 21', which is not toooo huge, but there are some really nice shorter ones out there as well:

The 19'10" Bullet by Keystone is one example.
http://keystonerv-bullet.com/index.php?pag...mp;model=180FBS The
Lance the new one at 20'9" looks good also. IMHO. I like the compact ones. There may be some shorter as well.
Escape has a
19 Foot they're buidling. And
Oliver also have plans for a
22 Foot.
Also the small 5th wheels would be nice, 19' Scamp
http://www.scamptrailers.com/Showroom/19Fi...FloorPlans.aspx and the 5.0
Escape makes very nice ones.
http://www.escapetrailer.com/Index.aspx?Page=Layout50 But not for a SUV of course.
Trailer length, instead of getting one as long as possible, IMHO should be based on how are you going to use it, what kind of camping, in private RV Resorts with full hook-up or in public campgrounds in forest settings, or national parks. Longer wider will limit the campsites in alot of campgrounds. No matter how good a driver. And of course how many are going to be using the trailer, a couple alone or with kids, how old, how many. How often it will be used, how far is it going to be towed, where it is use, mountains or plains, high country or flat land, low lands.
Another factor I'll mention again, compact lighter units should take less fuel to get from one place to the other. But it comes down to what you are looking for, need, want to have plus the tow's capabilities.
Even when I was in larger units compared to our Scamp, they were never really huge. The height of the C-class always bothered me more than it's length. Plus it's
weight. Some of our units were smaller than the Scamp as well.
As for being different camping in them, none, except having more room in them. Did not have to wipe the shower down as we do in the Scamp. Easier to shower, larger water tanks and holding tanks, which makes it a little more convenient. No rivets to break (but have had none break yet in the Scamp). Very roomy bed, a long queen sized in the MH. Could have quests in them much easier & more than one extra. But it has been easier to set up the Scamp once it is in camp, to level, etc. than the other two, the Komfort Lite & the C-class. They were wider as well as a little longer which gives a lot more space, especially the bed sizes. There seems to be more difference than I first realized. The Scamp makes it more like camping, less like RVing. Ha!
It seems hard to find one now without a slide out or two. They do give a lot of room, but I see them as just something else to go wrong and break down. Ha! My son has one in his Cougar 5th Wheel. Photo shows the difference in size of his rig & ours.
Good luck! I can understand going a little larger. But overall, I am very please with the Scamp. I really would not want to go to much larger than what we now have. It is really nice having one which is not much wider than our Ford F-150. I've done towing a wide load, not as easy at times. Oh, yes, longer trailer are easier to back up than the shorties. I also liked having two axles, yep, a plus for sure, tandem axles. Loose one tire, there is another to help.
But to be honest answering your question (
What about those 8 foot wide bigger 21 to 23 foot campers? Are they hard to pull?); No, not hard to pull, just takes longer mirrors to be able to see around them. And a wider spot to park them, but that is not related to pulling them. No, I would not say they are harder. But now that I am thinking about it, I may have not towed a 8' wide one. The Komfort Lite was not as tall or as wide as a regular trailer. But I do not remember how wide it was at this time. Maybe someone else will answer this as well. See if anyone agrees or disagrees with my answer. I believe I am correct. They will be heavier, however, which will make them less easy to tow. Will take more of a tow vehicle to do the work, as I mentioned before. It is the
weight, more than the length & width. Navigating them into parking lots, gas stations and around traffic, they will not be any where as easy as a Scamp or a
Casita. Therefore, the answer would be yes, they will be harder towing. How is that for an answer?

Or I could have said, they are not hard to pull, but they are harder to navigate, harder towing.

Not as easy to stop, at least somewhat.