7K PJ trailer with one 7K axle C1

what are you thoughts about buying a C1 Pj trailer it is a one 7k axle trailer to move around a 4k tractor. Would you worry about a tire blow out or sway since its a one axle trailer? is it better or worse than a 7k trailer with tandem 3500 axles?

The trailer would carry the load but tandem would pull better and handle load better. You can balance you load better on tandem axle. Single axle trailer will bounce more than a tandem axle when empty.

Hate to disagree d beatty, but for the most part it's the oposite of what you say. A single 7 will have a harsher ride due to not having the equalizers to diminish the bumps, but for the most part the ride will be more stable. The tires will be harder and provide a more solid ride. There is no difference in loading or ballance as long as the axle center is in the same place, so if the center of a tandem is in the same spot as the center of the single the load ballance and towing will be the same. There may be some slight advantage to the longer wheel base, but that will be very minor and it's not likely you would notice, and it would be offset by softer tires. You will get much longer tire life from a single axle because there is no alignment issue. As far as flats go, yes a flat means you need to change the tire, but the heavier 16" tires will get less flats in general so that is a wash in my book. The 7k axle gives you better bearings and brakes too. The single axle also eliminates the need to pull level and there are no suspension parts to wear out. If you get the torsion type axle you will never have a suspension problem. I have built a few 7k single axle trailers and everyone that has one likes it.

Here is a pic of one of the 7k single axle trailers I built many years ago.

I have a two year old PJ 5,000 lb. trailer with a single drop axle and like it a lot. No sway with my 2,500 lb. tractor on it. Being a single it allows me to easily sneak it in where needed. It pivots well. If I had to do it again I'd get the longer one and it would have the winch mount. Great trailer. The loading gate is very solid. I was told at purchase to use only trailer tires of my choice to reduce swaying because the sidewalls are much thicker.

no ifference in loading and ballance? that's pure bs.

take a single and dual axle trailer, now take a long load. like a tractor with a mower, or with a front end loader.

the dual axle trailer has way better options for getting a ballance at the axle, vs where that long end is sticking out. Can't back the thing on farther thanthe trailer is long, and who wants to hang some implement out 3' over the road.

I'll never own a single axle trailer that's rated for more than 1-2K ever again.

I remember trailering a tractor with a mower on a single axle and due to length and weight distro onthe tractor, we were faced with either the front wheels hanging off, or most of the mower, if we wanted axle ballance. If you actually wanted everythng on the trailer, you had a seesaw...

more axles, and longer trailers give you more options. I'd tke tandem 3.5's over a single 7 ANY day. for one thing you could get more brakes.. 4 drums vs 2... and in an emergency, in the event of a shelled out bearing or blown tire past your spare, you could pull 2 wheels or hubs off, tie up the axle or equilizer and run on 2 to limp home. lets see you limp home with a bad hub or no tire on a single axle job...

It's not bs, and I've been in the trailer business for 30 years. The center of the axles is the center regardless of how many axles are on the trailer, with the exception of torsion axles. As I said, if the trailer is the same length, and the center of a tandem or triaxle setup is at the same place as a single axle, the ballance and loading will be the same. Simple physics says so since the center is always the ballance point. I've built and sold trailers for just about all applications from yard trailers to semi trailers and most have been custom designs. I've dealt with these issues many times and one of the most common myths about trailers is that tandems pull better than singles. The most common reason is that folks will compare a 10 or 12' single axle trailer to a 14'or 16' tandem then say the tandem is easier to load and pulls better, when in reality the better trailing and easier loading is the result of the longer length.

To test the theory take any tandem trailer with an equalizer type axles and measure the frame to ground. Then raise the tongue and measure again and you will see that the frame stays the same height right at the equalizer. The same will happen if you lower the tongue. If the single axle tires are in that same spot the exact same thing will happen. Since load stability is mostly due to that ballance then they will be the same. As far as brakes goes you will have 4-10x1-1/2" brakes or 2-12x2" brakes.