I'd do it in reverse. Level side to side first, while you are still connected to your TV. I use Lynx Levelers rather than boards. Here's how I do it:
I have level bubble gauges screwed onto my TM, a front/back and a side to side. When we move into a space, i get out and check the side to side gauge first. If we're off significantly, I'll pull forward a foot or so, place a Lynx Leveler pad behind the low tire, then back onto it and check the bubble again. If we're OK, then I disconnect the trailer and use the tongue jack to adjust the front to back to a level position. That's it. Once level, I drop the four stabilizer jacks to give the trailer more support.
If you don't have the bubble gauges, you can just use a small carpenter's level.
Hope this helps.
Keith
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