I can't put on my bummer due to towing. I don't expect issues, but if there becomes a hint I will take off the 2m. Options were just limited.
It won't be a hint, it'll be a "poof". One day it'll work fine, the next time it won't. It isn't a cheap fix to send your radio back to Icom for repair.
By having the antennas that close together, they are going to couple to each other and likely affect tuning. That will also allow the RF to couple and get into either side of the radio. It won't matter what band you are on, the soft dangly bits of the radio that get toasted are well before the band switch.
Think SWR, if too much RF gets backwashed into the radio, it will cause damage. Same thing happens when an antenna is transmitting to close to another receive antenna, the RF couples and goes back down into the receiver.
I've seen this happen between a 50 watt VHF radio and a 35 watt UHF radio. Antennas to close and the 50 watt ham radio lost it's receiver. A 100 watt HF radio and a 50 watt VHF/UHF radio will likely have the same issue.
I'd tend to agree with the others, put the VHF/UHF antenna on top of the cab. Bite the bullet and drill the hole for an NMO. It'll work better in the long run. Other option would be to put the screwdriver antenna on the front bumper, or very front edge of the hood on the passenger side.