Risky yes, the risks can be managed of course,
correctly installed and vented is high on the priority list followed by secure fire proof mounting and shielding.
a guard would almost go without saying, and use on the move
totally prohibited
But and its a Big
BUT, is your insurance company aware of the heating method proposed

Geo
And where on earth are you going to store the fuel for it
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2004 DAMON CHALLENGER RV 6.8 Ltr V10 0-60 in 4.6-------------------------Gallons
If it is'nt a V10 then it,s a whimp, wana push!!!!!