True, the taller tires would provide additional clearance.
My question though, is just how far back are you planning to go that you think that a trailer wouldn't make it as-is? There's a certain point at which, you circle up and camp w/ a trailer, and if you want to go further, you switch to packable tents.
IMHO, the problem is, you would only gain an inch or so w/ the tire change. As UK4X4 here said, you have to go with a spring-over to gain noticeable clearance with a trailer. If it's a shorter trailer, you will gain more advantage, but a long trailer won't gain as much, as the longer the distance between the axle and the ends are, the more that they'll hit; as one end goes up, the other will go down....
Don't get me wrong, I understand the appeal of having a bit more comfort, a sink and a fridge, a bed, a toilet and shower, those are desirable things. But there's a point where you need to either make sure that you're looking for a really short trailer to help in the off-road use and maneuverability, or you can go with the larger trailer for more comfort and limit just how far you take it along....
Now, FWIW, I've seen a caddy towing an airstream WAY up forest service roads, where most folks thought I was mad for taking a Subaru.... so, you just might be able to get a lot further along w/o anything fancy needed.....
FWIW....
