I guess with a 235/75 tire you would be OK. A 7" wheel with 5.5" of back spacing is a lot, do the alloys have the same?
I have also seen Nissan Hardbody chrome rims on some Isuzu's and Toyotas. They look nice too. Lots of six lug options out there since all the Japanese SUVs used the same bolt pattern. If it was me I would be looking in the wrecking yard for a matched set of wheels off of any 6 lug Japanese SUV that fit over your hub. You can look up the offset, lug pattern, backspacing and center bore online.
I have to admit, a stock 2nd generation Isuzu Trooper is probably one of the most innocuous stock vehicles out there. Most folks hardly give them a second look.