we have an opposing slide 35ft trailer, with an extended bumper. Overall I am 65ft with the bike rack on the back bumper. that's the legal length limit in most states, although technically I am illegal in some states that have a 60ft or 55ft overall length limit.
We do need to watch campgrounds. 4 things can affect our ability to get into a site and get set up
1) pad length
2) radius of turns on the road in the campground!
3) width of campground road.
4) site width and location of hookups if available. with opposing slides we need about 20 ft of clear width for the back 12ft of the trailer to put the slides out. On rare occasions this has been a limiting factor in picking sites.
There are sites where (1) is more than long enough but (2) and/or (3) prevented us from getting into a spot. At all costs avoid (2) could get you in REAL trouble!
That said, we tend to like more primative campgrounds, which means the above comes into play more often than new campgrounds. But we have always been able to find nice campgrounds near where we wanted to be. sometimes not the closest campground but still nice campgrounds. The usual limit is while a 20ft trailer can pick ANY site in the campground, we only fit in some of the sites usually 1/2 or so.
If you want to be almost assured you can get into virtually all campgrounds stick at 20ft or under with a small tow vehicle.
And state parks vary. In oregon you could get a 35 ft trailer into a spot in virtually all the state park campgrounds. We've visted most of them and a reasonable number of sites will handle us.
In some other states we've visited state parks are more limited in sites.
Same for FS and NP campgrounds, Many we've visited could fit way bigger than our trailer, others had a few sites, and still others are limited to trailers in the 20ft range.
