I'm also in PA and just bought new binders and chain earlier this month. PennDOT rules for hauling small machines are somewhat vague. I'm not a lawyer but recently went through the regs and here's my take on what they say...
Non-commercial under 10,000 pound machine - it needs to be "generally secured". So basically it's up to you. However, consider what PennDOT considers secure for a commercial 10,000+ pound machine which needs a chain at each corner of the machine (fronts with min WLL of 50% machine weight, rears with min WLL of 80% machine weight). You also need separate chain or straps for any attachments or hydraulic arms (like a loader). So for a tractor / loader set up, you need 5 chains or straps and 5 binders. (there are ways to do it with less chains if your chains are long... i.e. a long chain with two sections that are isolated from each other (loose links in between) with separate binders is considered 2 chains.
I would not use straps even though they are legal simply because they cut to easily and loose strength in sunlight.
Per the law you can generally secure it however you wan. However, here is what I would do for your set up (I do the same but with heavier chain in the rear which you don't need). Buy two or three 16 foot 5/16" link Grade 70 chain with hooks on the ends (this is overkill). Buy five 5/16" binders. Go from the back corners of your trailer through your drawbar mount and use a binder on each side to make it two separate chains. Do the same thing in the front going to the front of the frame. Then put the last chain over the loader (or you may want to use a strap for this so it doesn't scratch your paint). If you use chain and store them dry Grade 70 seems to last just about forever, especially since 5/16" is overkill for your needs. If you go with straps you will need to replace them when they weaken but how will you know when that is? The chain and binders will cost you a bit up front, but can last forever with care and at least you know your machine is secure if the worst happens.