Moss, how many and what size straps do you use to tie the tractor down? I've been waiting so long for this that I'm thinking about 4 dozen 5" wide ones... some plastic wrap, pillows, maybe some goose feathers...
I started with straps, but quickly changed to chains for holding the tractor down. The straps got chafed pretty fast on the edges of my trailer. I use one chain through the rear pin hitch, to each corner of my trailer and a load binder. On the other end, I used to chain it to through the FEL arms going over the buckets. But I then added a tow hook to the front of the machine right on the "shelf" where the FEL lift cylinders, directly in the middle of the "shelf". I run the chain through that and to each side of the trailer. Then I rev it up and drive backwards to put tension on the front chain, set the parking brake, and spin the front tires until the brakes engage both front wheels. Then I tighten the load binder on the rear chain, the machine squats on all four tires, and its not going anywhere.
When I used straps, I used one on each ROPS arm to the sides of the trailer. One one each side of the hitch pin to the sides of the trailer, and one across any implement I had attached to the tractor to both sides of the trailer.
If I was bringing one home, and two skids of attachments, I would probably start with having PT load a skid on the front of the trailer, drive the PT onto the trailer with an attachment on it with the FEL arm raised. I'd put a few layers of cardboard or padding on top of the front skid of attachments, make sure no hydraulic hoses are in the way, then drive the PT forward and lower the FEL arms with attachment down onto the cardboard on top of the front skid to help hold it down. Then I'd have PT set the second skid behind the PT on the trailer. Strap down the front skid with a couple straps. The PT with straps at the FEL arms, across the center under the seat area, and through the rear hitch pin. Then I'd secure the rear skid with at least two straps and maybe a third the long way from the back of the trailer to the PT hitch pin, to help keep it from sliding back.
Of course, this is all dependent on how long the trailer is, the weight balance of the skids, PT425, etc.... use good judgement and make sure your trailer is balanced with proper tongue weight, etc..., etc... You'll have to play it by ear.
Just be sure if you're using straps to make sure they aren't over anything sharp so they don't cut themselves as you travel. I'd also stop about 15 minutes out and check them all again after highway speeds. Things have a tendency to shift and settle with wind and road vibration.
Also, remember, the thing only weighs about 1500 pounds.
Many small 1" straps are rated at 1200 pounds. A lot of 2" straps are rated at 10,000 pounds. For the price, I'd go with 2" straps and a half dozen of these tie down assist straps to help with attaching the straps to things like the ROPS and hitch pins.
Erickson 1" x 18" Tie-Down Assist Strap 2 lb 563 4 by Erickson Mfg Ltd for $1.49 in Towing - Emergency - Vehicle Accessories - Automotive : Rural King
Of course, I'm not a doctor and don't play one on TV, your mileage will vary, and don't take my word for it, etc....
