Please be careful! For me, it is too close, but your mileage may vary. Vinyl siding melts and it can be expensive to replace and worse case scenario, it could ruin your holiday.
I have PermaBase (concrete underlayment from Lowes) I put around things when I am worried about heat or fire.
KCBS CBJ # 66647 Blue Weber OTG, Masterbuilt 7 in 1 smoker, Weber smokey Joe, UDS