like resident grump mentioned, I wouldn’t mess with your truck battery. It’s not fun waiting on a jump start or getting stranded or being stuck in front of a customer’s house with a dead battery. Here’s the spec on the " hot link"
• 12v DC for remote use, hook to the
battery on your pressure washer
(requires 14 amp charging system)
Most likely your washer doesn’t have a 14 amp charging system so plan on charging the battery. Keep an eye on how the burner is firing, if it miss-fires a lot or you see smoke, the battery is probably low on charge. Don’t let if run like this because you’ll load up the insulation and coil with raw diesel and that will turn into you needing to pull the coil, clean it and re-insulate. Time and $$.
If you have the space or need a generator for other equipment, I would go with the 115 volt.
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Or worse and catch fire 
. If you go with a marine starting battery like William said and keep it charged you’ll be fine.
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@Innocentbystander I can quote now also
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@Innocentbystander
I agree, but if you already had a 12v burner, it might be a good plan. And again, could also charge up for a 12v pump setup, and allow for a much more powerful pump.
We call it redneck engineering around here. 
I’m on my third 12 volt burner. Never had any problems except had to change out the transformer on one. Knock on wood!! But all three have had twenty amp charging systems. Would not want one with any less and have never had to charge the battery. Thank the next I will go with the generator that’s connected to the pulley. Thinking about installing a clutch on it so the generator spins only when I need it. Seems like it would make the generator last twice as long. Mainly want it for lights and to charge 20 volt batteries and a shop vac!!
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Install this clutch on the generator. It can be pressure or flow activated. Then just install a switch on the wire that engages the clutch to turn it on or off. Since it would be flow activated they would always be power to the on and off switch.
